Hi all. I am new in here and in aiplanes too. I had a lot of experience in free flight when i was a little younger

I have built a bigger airplane too which had a rudder and elevator but never flown it sonce i had not the engine for it
now i want to start again. im in a very small town so there is no body can help me around. i have my radio but nothing else. i want to build a very small slow flyer. i am confident than i can build my own design.
My first question; i was searching for a very small engine with a throttle control. The best choice seemed a cox engine but i could not find any with a throttle. i found another which is called AP 09 engine. it seemed good but i wanted to find a cox. does any bbody know how can i find it??
secondly since i am a begginer i want to make a small and a sloww model (i dont want any electric models) and i am thinking that not to use ailerons. would rudder be enough for me? could i control it as i want to?? note: i dont want any areobatic actions for now.