self employed, u can not do if they get there work off u and u supply all the gear and work and tell them what to do,  if they work for some one else a few days a week as well, then they can be self employed,    u could try a cis card and becasue u can supply all the work and gear, but u have to take 18 % tax of them and they sort there own NI
Paye   normal rules apply
casual worker,  same as paye, ie tax and ni,   just mean u can finish them up
cash in hand,   i would do this for a few weeks, till u know there are the right person