my 2 cents worth,
slow stick is a good idea. it will let you learn on a four channel. and it is easy to fix.
make sure the plane balances front to back AND SIDE TO SIDE. all throws are set to instuction recomendations.

where you will get bit is trimming out the plane. all trainers when trimmed will fly level and straight at a specific throttle setting hands off.
so when you take off climb without turning and level off reduce throttle to around 1/3 and let go BREIFLY. if it climbs or dives adjhust elevator trim if it rolls adjust aileron trim just a clic or two and retry. SMALL CONTROL INPUT will aso help good luck