There is no jump or Challange it's all a preception. Here's the simple 5 step process for ya.
1. Sell your Paintball shit (or don't) using the appropriate channels.
2. Get age verified here.
3. Use money made from selling paintball shit (or whatever) to buy airsoft stuff you have researched via this forum and the magic of internet queries.
4. Search for local games on these boards and others.
5. Attend local games and have fun.