Splitting Owner-Op / Lease-Op driver pay & LLC revenue?

So how do you do that,se,madicare,states taxes when paying ur self a salary ? Or cpa will do all that too just want to know b4 I go to cpa since it will be two check drawn from llc.
Also was told by the guy i leased from to just get a ca number and simply file for a " doing business as" and then open a business account.
Wats ur opinion on that
Thank you.