Hi Tyronegirl,
I have been contracting for a number of years & you should operate as a sole trader for as long as you can & avoid setting up a Ltd. company. The administration & cost / time to operate a Ltd. is too much hassle for a one person type operation like yourself. However having said that in my industry it is getting harder to find contracts as a sole trader & more & more companies / agencies will only deal with a Ltd. company, so as I said, if I were you I would stay as a sole trader for as long as I can, & if for what ever reason you need to change your status to a Ltd company this can be done in a couple of days. You should also register for vat from day one & charge vat on any service you provide.
Good Luck !