You don't need to hire anybody - that's what we're here for.
You can run all of your electronics (fish finder, radios, lights, livewell, etc) off of 14ga wire like you can get at home depot or lowes.
I think your FF should have a 3-5 amp fuse, but I'm not certain on that.
If you want a switch panel with fuses already, you can get a pre-made one from bass pro - then all you do is run main power wire from batter (14ga will work) then run a line from each switch to each electronic piece of equipment you want to turn on.
Since you only have 2 batteries, the higher the amp reserve hour = the more time out on the water with a charged battery. I have 4 - Everstart Maxx 29 Deep Cycle batts from Wal-Mart. Two of those batteries are ran in parallel (pos from battery 1 to pos on battery 2, and the same for the negative terminals). That set of batts runs a 40lb foot control on the bow, radio, fish finder and livewell. I have 2 batteries in the rear in parallel as well, and the run 2 - 55# trolling motors. I'm using 4ga wire to connect the batteries to each other.
The trolling motor wiring is 10ga, so if you need to extend your lenght, use atleast this - but remember, the smaller the gauge number, the bigger the wire which means less loss.
Ask any questions you have, there are more than enough people online at anytime to help you out.