Anybody help me?
I need a bit of help with my filling in of Self Employment form

I have a CWF1 form - i have filled in the all the simple bits but its asking me of name of business etc - can anyone tell me what to put in?
I work full time but Im doing bits and bobs in extra/background work p/t - not getting regular stuff through ATM but dont know how to fill this in.
Been told that the start date is the date i have signed with my agency (Nov) despite only getting my first job in April but its just the rest i cant work out how to fill out.
I also have an NI form they sent to me - do i have to fill this out too? or is this already done through my full time job?
also, random question - probebly no use - but when you get paid, can you pay towards your tax at the time instead of a lump sum at the end of the tax year? - saves me having to keep it aside all that time - i know there is a DD but i do not make a regular wage - i will only get jobs every couple of months and varying sums.
so many questions - gawd!