Engine breakin: See the following good website for engine break in instructions: http://members.home.net/moorman1/ABC.htm Your engine actually is ABN (Aluminum, Brass, Nickel, not AB C-hrome, but same break in procedure for a non-ringed engine.
How to tune your engine can be found in links listed on this website (RC University) http://members.home.net/rcuniversity/RCUCatalog.htm Please read as much as you can to become familar with the principles of RC engines and other RC related topics.