You have to stick with it, it often takes a long time to work your way up the ladder in order to get money. Here is a great sports job board website for you to take a look at many of the entry level jobs http://www.teamworkonline.com. Many of them don't include the compensation for the jobs but a great website for that is glassdoor.com. Hope this helps and best of luck!
Popular sports make a lot of money when compared to other sports. Eg. Football, Cricket, Baseball
If you're good in any popular sports then make sure you do some small projects and work under an experienced professional to understand the process flow.