It all depends on what school you play at. If you play on a DI, DII, or DIII team, you will have to work much harder to play for the school. Lacrosse it a really easy sport to pick up.
Since you have played football before, you have an idea of what needs to be done, footwork, and positioning.
For lacrosse terms, check this thread out:
http://www.lacrosseforum.com/lacross...rminology.html
It has a lot of information on terms and explaining them.
For rules, check this out:
http://www.lacrosseforum.com/lacross...sse-rules.html
If you need any help understanding the rules, send me a PM.
I hope you have the best of luck and good luck starting up!