Just make sure you keep your overheads low and dont splash out on things you dont really need like expensive laptop etc.
A good extra is to supply a decent antivirus if needed. Its surprising what you can buy kaspersky for at auction and then sell on for good profit but still give the customer a really good price
Word of mouth is the best. I am lucky as i live in a smallish town where everyone knows everyone so people soon get to hear about me though i do advertise as well in local monthly magazine.
Paperwork can be a pain but the wife seems to enjoy it