When you're assisting you're not shooting. Basics aren't of much use, lighting is impt 'cos you need to be able to understand what the photographer wants when he says something. You're there to help make the process smoother, think ahead of the photographer on what he needs next and take care of it. You have to be very fast on your feet, fast, accurate and careful. Very careful, can't go around breaking your boss's lights and client's vases. All photographers troubleshoot on the spot, so the assistant needs to think as fast as well. I've been at it for almost 1 year now, and I still can't think fast enough, maybe you're younger so it's easier. hah.
If lighting is an issue then I suggest you rent a studio with a friend for a few hours and familiar yourself with the equipment and their lighting effects. Honeycomb grids, softboxes, umbrellas, bouncing all give different effects. Have a plan on what to experiment on, play with lighting ratios and angles, bring in different materials like black velvet, chrome, etc and try and figure out how lighting plays its part.
And I kid you not, but learning the proper way to clean various materials, how to iron different cloths is also an added value service, especially for photographers who shoot much product. Cleaning is an important aspect of assisting, you clean before you even set the lights.
How about you make a visit to PPAS website and try contacting the photographers there. Do some research on what they shoot and see if you like their work. My advise is that you look for a small studio or those 1 person outfit. The pressure to perform is much greater but you learn so much more, whereas in big studios there are already multiple assistants and as the newbie, all you'll get to touch are cleaning materials and winding up power cords.
You'll get scolded a lot initially, but as long as you pick up fast and recognise the photographer's routine, you should lessen the chances of it happening. Unless the photographer's attitude sucks which in that case it's not really your fault, the photographer would know your skill when he/she hired you.