I just got this plane for christmas, and i was incredibly excited to get to work on it. However, I immediately noticed on the front cover of the manual that it requires
5~6 cannel 6~7 servos. The website says a 3 channel radio is required. I only have a 4channel radio, so I thought i'd be alright, but I guess I won't be able to use the airbrakes or retracts unless I get a new radio[

].
I have a question regarding servo selection for the control surfaces and also the main gear and airbrakes. What size servos should I chose, and what brand is most reliable? I'm sort of new to servo selection, since my neighbor would do it for me in the past. He's not going to be around for a few months though.
Thanks.