hi Jennie, welcome to the forums!
you'll find heaps of info in setting up your company and I wish you every success!
p.s. I'm a virtual assistant part time - I only work on this approx.15 hours a week and I find that being a VA fits into my life very well as it's my 2nd job and I do this in the afternoons after my DAY JOB, and I keep evenings free for TV and socialising