new to kayaking

 I am an old retired guy who tries to spent the summers in Alaska camping. I spend a lot of time in Homer camping next to fishing hole and thought it would be a great place to have a kayak to fish close to the spit .
 So i got a deal on two 2010 Hobbies 12 ft outbacks. I have had them since November and haven't put one in the water yet so have a lot of questions about fishing for halibut ,salmon and rock fish from them.What length rod would be best,length of gaff hook and harpoon.I have bought a Garmin depth finder/gps and haven't figured where to mount it yet.
 any help would be appreciated.

Welcome Clay!

The NWKA Team Alaska is currently gearing up to fish the Homer Winter King Derby.  Even though I grew up in Kenai, I think its insane that we have the opportunity to do so.  This winter is been a bit rougher for us...well, more the normal winters.  Its actually cold.  lol. 

Looks like you are in WA now.  Are you planning to come up and fish the Homer area?  Or is the advice you are looking for more for WA. 

I have some basic information for fishing Alaska that you can find at AlaskaKayakFisher.com  If you scroill down I have a few videos posted.  But really, the information in the Alaska section of this site is better in many ways because it comes from a diverse group of folks.

Lots of good info here!

I plan on being in Homer from the last week in July to the end of August camping next to the fishing hole in the city campground. My good friend Colt has done well in the  winter derby.

Welcome Clay.
You will find you have landed on a great spot for info and resources related to kayak fishing and plenty of help on kayak rigging. (I learned a great deal from Kardinal_84 long before I bought my Outback.) With the diversity of folks here and the wide range of ingenuity and innovation you shouldn't have any trouble finding details for rigging that will fit your plans for the kayak. Searching by keyword will help but just scanning the thread list in Drillin' n Cuttin' may be a more direct approach to spotting the exact help you need by the title of the post.

Sounds like you might have a Garmin Striker? If so I rigged up my 4DV last fall on my Outback and posted the approach in the Drillin' & Cuttin' forum. You can mount the transducer very easily by using a block of wood as your modified mount for a great fit IF you have the Lowrance-Ready pocket.  There may be a "conflict" in my rigging vs your 2010 Outbacks. If you don't have the "Lowrance-Ready" hull pocket for mounting the transducer you will need to follow a different approach, like mounting inside the hull for shooting through the hull. Lots of posts on that method too.
 http://www.northwestkayakanglers.com/index.php?topic=18361.0

A few tips I learned in planning your layout of gear on the kayak:
• Being left or right handed makes a difference when rigging your boat, fishing and especially landing and handling fish.
• I'm left-handed so when landing a fish or harpooning a halibut, I want to hold my rod in my right hand and pull my rod to the right away from the fish on the left side of the boat (drawing it to me) and out of the way of the net or harpoon in my left hand and land the fish on my left side.  If you are right-handed think in reverse.
• That means I want my fish finder and rod holder on my right side where it will not be in the way of handling my catch and bringing the fish aboard. And once in the net I can put the rod back in the holder.
• Having a vertically extended rod holder provides clearance for your knees and legs to work the pedals.
• I haven't rigged a downrigger yet as I am a newbie to kayak fishing and don't want to complicate my learning curve. I intend to rely on jet divers to reach the depths I need for kings off the Homer Spit and Whiskey Gulch. In fact the waters are so shallow along WG beach where you troll for migrating kings a downrigger is not necessary. I may eventually rig one but fishing the Spit for kings doesn't need one most of the time either.
• Gaffs: a halibut 30 pounds and up is a powerful beast and sitting at water level sticking that hook in him sometimes paralyzes them (at least for a short time) or makes them go berserk. If they are thrashing with a gaff in them you run the risk of injury to yourself with that point being a deadly weapon or doing damage to your hull.
• Plenty of harpoons available in AK. Danielson makes a cheap one complete with spear point that you can cut down and modify for being suitable on your kayak. Trustworthy Hardware in Soldotna carries a rack of them including additional points as spares.
• Rockfish will be a problem on the Kenai Peninsula. We just don't have much holding water for that species that is typically in reach of a kayaker. Some are found offshore of Anchor Point but you better have a GPS waypoint to go to. Its a lot of empty water out there. Lots of pollock, Pacific cod and if you are lucky even sablefish (black cod) can be had around the Spit area besides the kings and halibut. And the Fishin' Hole will have silvers arriving when you are here.

With your present location in WA you have the opportunity to hook up with locals in your area to get your feet wet prior to your journey to AK. It would be well worth the effort and you will meet some great folks that have the methods dialed already to speed your own learning curve.

No doubt we will meet up this summer. Many AK kayakers will post their trip intentions on the AK forum when they are planning or thinking about a trip. Since you will be hanging around the Spit during the summer you will be a valuable asset for information for the rest of us. 

Well you are only as old as you feel. I just knocked out another Bday yesterday. Woke up this morning and don't "feel" any older.