RE: I need some advises and help from nitro pilots
I beleve you are talking about the Pheonix Strega. If so it is the warbird that I do highly recommend for a first warbirds and it is the vehicle we use extensively for warbird pylon racing with engines from .46 to 1.10 However it is a major jump in performance from typical parkies and to answer your question the landing speeds are far faster more like three times as much from what you are use to.
The LA 40 is a poor choice for this airplane and will cause protracted takeoff runs, the kind where folks tend to get into trouble.
At the very least get an experianced pilot to do the maiden and do the initial control tweeks. Ignore the CG in the instructions and balance at 3/8 inch forward of the aft edge of the spar (where the open bays start.
John