Tryin to scratch build a german Pak 43 in 1:32 i got the basic blue prints now i need help on how to get started

Did you get the blue prints printed to scale size for one to one reference? If not you'll need to convert by ruler or scaling program. You'll need afew given size references to know what's what length or width...a given set of knowns...a tire and/or rim O.D. is enough. After that, clear a space and pick a place on the blue print and start building. Nothing like taking a pile of evergreen plastic bits and making "something" out of it{or brass if that's your medium of choice}.