I just got ebay auction# 5901378055 .

I decided i wanted a fast, good quality, 60 size, 2nd plane, and the Sig Four star 60 gets it.

I need your help on a few other things still.
Im using my ALPHA's servos, rx and tx. I can do that right? Also i need 1 more servo will any work? Whats the extra servo for?
From experience how easy/hard was it to put together, any tips, suggestions?
What engine would YOU put on it? What would i need to put on it to call it "FAST" . My friends alpha 60, i dont know what it has but its slow.
What else will i need to buy?