RE: First time with soldering!
I hate to pull you away from the forum, but do you have Hobby shop near you? If you do, considering going by there and asking for help setting everything up. Usually, they are more then happy to help. This can all be a bit confusing, especially the electrical stuff, and if you accidentally short something (like a lipo) it can lead to a very bad day.
so far it looks like you are on the right track. I am not sure what kind of wires you need for that balancer. Should be a 3-4 wire wire that would run to the battery. I think the side with 2 jacks is to allow you to balance 2 cell or 3 cell packs. The other side might be for connecting to a charger to balance while you charge.
If this your first plane? Or are you just new to electrics?