NO such thing as a stupid question.. when your not sure ask that what my father always said.
Any ideas what kind of boat you want to build? sail yacht? tugs? cruiser? etc
I'm assuming your intending to scratch build from plans? starting simple is aways a good thing.
Battery, radio, motor, ecs systems have changed dramatically in the past 15 years, I agree with Tobyker that Action electronics is a great site to check out for wiring diagrams, and all manner or electrical equipment for internals suck as esc's motors, mixers etc, prices are pretty reasonable too.
While your on the subject of looking to join a club be sure to check what they regularly sail,l many clubs now tend to avoid IC engine run boats but don't be put off if thats what your into there are loads that still can and do run IC quite happily ( my local club has an outright ban on Ic due to locality of the lake ( bang smack in the middle of a village)
Also check the clubs insurance policy ( IE club fee if you have to pay if they have insurance.my local fee is £45-50 a year but that covers the clubs insurance) i have my own personal liability insurance also which also covers accidental damage to my boats, i also sail at other location with out my club so £90 a year to me is worth it for peace of mind that if anything goes wrong I'm not going to end up paying a fortune i don't have)
Prophet