Welcome to fold. Its fun and friendly.
In terms of tools, read the plans. That is a 90% solution set for the entire project. Starting small and networking with fellow RV-12, EAA, and other builders will get you good advice, an extra hand now and then, and the loan of tools when needed.
My list for you would include
Snips
Good drill bits (not HF/Loews/Home Depot cr*p)
Scotchbrite pads
Scotchbrite wheel
Manual Rivet squeezer (I am a big fan of the Cleaveland high end one)
Squeezer Die (a bunch)
Set of needle files
Deburring tool with bits
Counter sinks
Deburring hex bit
Boelube
I assume you already have a good grinder, drill. Drill press and band saw would also be helpful, even desktop versions
My favor vendor is Cleavland Tools (
http://www.cleavelandtoolstore.com/), though all of the major players are of good quality (Avery...)
My blog and many others are available to you here, and we all have opinions on just about everything.