You said that you had "the manual". I'm not sure if you meant for the plane or engine or both so just in case here is the engine manual:
http://www.osengines.com/manuals/40-46-65la-manual.pdf

Definitely find a club and instructor who will help answer many/all of your questions. We'll always be here too. Wait on purchases until you get to the field as you may find that someone there may have good used or maybe almost new stuff for sale at a great price. They will certainly know where to get the best prices and know the best (in their opinion) equipment. Ask the various members what they have in their field boxes and why. From there you will be in a better position to make your purchases wisely.

Welcome to the hobby and to RCU.