Hello Graham,
Welcome to the forum. There are many experts here who will be able to advise on motors, propellers, speed controllers etc. once you have chosen your model.
As for the radio side, these days it is more or less generalised to all boats (although there are some more specialised transmitters /receivers with special facilities…).
Also, when it comes to constructing the kit, you may find that there are some areas which need a fuller explanation. Often there are very knowledgeable modellers who have 'been there before'.
Just ask…
Good luck and have fun !
Dave