Ask all your family and friends to ask there family and friends, knock on everyones door in your street, put a sign in your vehicle with contact details, any customers you get, you will have the time to do a top job, so do it, and then ask them to ask their family and friends.
Go on vista print and order some business cards, they are free for 250, just pay £3 postage,
Any opputunity you see, go for it, if you dont ask, you dont get.
Good luck,
Oh and go on ebay and get some polo shirts and jumpers with your details on the back, looks pro and its all advertising, even when you are stood in the shop at teatime, someone will ask you.
Where are you by the way?