Welcome aboard,
Nice introduciton good to see a new injection of entusiasm
I am sure your background as a drama teacher will serve you greatly in magic. Soon you will realise (hopefully

) that it is the
performance of an effect that makes it magical rather than the workings/effect itself.
There is a premis in magic to try and consider yourself an actor playing the part of a magician, that should be no trouble for you.
Do not worry about purchasing magic online use the reviews to search for reliable dealers. As for individual effects it is part of the process to buy tihngs at first that wont be suitable for you. But this is part of the learning curve.
Dont be shy to ask questions about questions about paticular products so we can help you decide if they will be suitable for your perfomance needs/ venue ect.
To begin with if i could recomend one thing, and one thing only. It would be
Mark Wilsons: Complete course in magic. It will teach you so much about many areas of magic. And is an absolute bargain i think it will cost you about $25. Truthfully you may not need to buy anything further (ever!), but i assure you you will
Hope that helps
The Keymaster