True imo. The main would advertisements. Getting sufficient prizes as reasons for people to join up. I was heavily advise trying to get in touch with some big companies to work with you with more reasons to bring them customers and you traffic. If you say live in the UK, or EU you could try to get intouch with www.multiplay.co.uk (please tell me if i'm not allowed to post the link) and try to maybe organise an quartly tournament and hold the grand finals of it at their i-series LAN events.

Well thats if you want to make it big. I know of a few leagues that have come about that have been able to sell themselves to others to make their league. And they are only been started in the past year or so.