You really won't have a chance and you've already made one of the worst mistakes of all.

You want to, "I'm thinking I should just full throttle liftoff .........."

You really need to find an experienced modeler. What you think is a safe test is most often the reason maiden flights wind up badly. The too quickly applied full throttle takeoff kills more models than any other cause.

And you've assumed that you've got a straight model, with sensible throws, that's balanced well, has the right prop for the engine, has a decently running engine.............. and a few more.

The list of clubs is an excellent start. Find out where they are and try to contact someone from the closer ones. They'll be glad to setup a testflight if that's all you want.