The Twister and a 27mhz will be fine, you'll just need to make 100% sure when you go out on track that nobody else is on your colour. 2.4 will be a lot easier as it takes all the worries and glitches out.
Good to start with something slower anyway, as you'll crash at slower speeds and therefore break less.
Come along next Sunday to our indoor race, your first race is free. You'll find lots of people willing to help out on your first race.
