RE: just starting out bulding from ebay
Beyond the fact that the engine you purchased would be a disappointment in that airplane It does not matter since a 'good' instructor/mentor is not going to want to waste time trying to help you with that airplane.
On the up side though that engine would be just dandy for an appropriate trainer. Don,t buy anything else until you talk to the good folks who are your potential mentors at the local club.
John