Outsource business advice?

I would want to start making money by outsourcing projects such as web design, seo, etc... and I was wondering if anyone would be able to give me any advice on this? What I wanted to do is find customers, locally, that need a website, ask them what they need and outsource the web design work to someone else for cheaper and get profit from the difference and I was wondering if this would be a good idea or bad? I was also wondering if I have to tell the customer that the work is being outsourced? And if they do ask would it be okay to just say that I've got an online team that will be doing the job? And how about tax purposes? How would I handle this? For example if I had a website to design I would pay the designer $100 and then charge the customer $200 would the $100 go for business expenses? turnover? and would I just be priced for the $100 profit? Any advice? Thanks.

any1?