This and any industry is about sweat equity, not so much your budget, if you're willing to put in the time $300 could go a really long way. What are you passionate about? Is it just making money or making money pushing a product you are exciting to work on every day? For me I have built a great business providing services and I can lead gen without costing myself a $1, look at craigslist around graphic design and go to the graphic design section here to find a provider as an example, there are lots of products on here that you can either consume or sell.