I can't disagree that the basics should be your #1 priority, but . . . flaps on trainers are fun!

Other guys want their planes to behave like helicopters - I'm coming in slow but steep and trying to polish my STOL techniques.

Heck, you've got a computer radio, might as well enjoy it.

Now for the lecture. Do as they say and practice high. Flaps can cause a plane to flair and stall. This can be corrected with an elevator mix on the radio once you know the situation exists. Also consider that you probably don't want the flaps moving more than 1/3 the full travel of the aileron. A little dab will do you - especially at first. Otherwise, you'll come in like a yo-yo trying to compensate for the ballooning.

With a flat bottomed wing it is quite often better to set them up as spoilerons. My RCM 40 tended to float on forever (especially as I had a TT.46 in her nose and had some idle issues in her early days). A club member showed me how to set the ailerons to both raise SLIGHTLY, robbing the wing of some lift. With the .46 I could climb out on takeoff 'like a homesick angel" anyway. I don't think flaps on a non-scale model are really necessary, and might be bad. If your model won't take off properly without flaps it might be trying to tell you something ("I'm too rich!" "My nose is too heavy!" "That ServoSaver you put where you weren't supposed to has slipped!"). A bad taxi & aborted takeoff attempt is less embarrasing than a failed takeoff and subterranian noseplant.