Hi Citizen,
I agree with what has been said before. I started my business by selling on ebay. I would strongly recommend you stay away from popular items such as Iphone as a first business as there is a very high level of scam, fraud + you will need your items to be kept under high security as ebay business account show the business' address so beware of havign your stock stolen...
When I started on ebay, I sold my own junk so I could have an idea of how to sell best. It is a very very steep learning curve and a year down the line I am still making mistakes.... as with every business, it takes time for the money to start being "yours", I am still skint because of reinvesting everything I earn into new stock...
As for business loans, again my personal is to be extremely prudent with that sort of things... how can you guarantee that your business will be a success and that you will be able to repay this loan?
I started by investing 20 pounds here and there, use the profits to buy more etc....
Wishing you all the best
Sophie