You may be able to get a business loan from the SBA (small business Association) but you will need a detailed business plan to submit to them. But I suggest that you do something like Tom suggested and get established somehow other than just jumping into it and getting a space because you are going to need at least a few customers who will come to you with some steady business because it is hard to open a business and be profitable in the first year or two... Especially in these tough economic times where people are trying to keep every penny they have just in case they lose their jobs....I'm not saying it can't be done but I am telling you it is very tough opening a shop like that out of no where and generating a customer base with no previous customers....I am a business major in college and know a lot about what it takes to start and run a business so I know it can be done with a lot of hard work but you are going to go through periods of no income in which you are going to have to have a nest egg as well as regular customers to keep some sort of income coming in....
But there are also other factors in deciding whether or not to start a business such as what the competition is in your immediate area and what type of things they offer and at what prices...If you can be profitable competing with them and there prices you should do it if not try and figure out a specific niche that they don't fill and emphasize and advertise that you can do this and get some of their customers in the door. Say for example if they don't do custom builds offer that, or if they don't deal with certain hardware or software make sure to offer those services.... Then make sure to be 100% ethical with people so they continue to comeback cuz it is cheaper to keep a good customer than it is to attract a new one....