Forum's are an excellent source of advertising they bring you into direct contact with potential customers. Place your add here in the offers section once your entitled to do so.
SEO is hard without spending a lot of money but you should still do everything you can to help your SEO efforts that cost nothing.
As has been said many times, Local advertising, friends, family, business contacts target everything and anyone you can.
You are competing with many providers, if your just starting out things take time if you have 1 customer after three months don't worry about it, business will start to grow it just takes persistence and time