Having met these two guys, Josh Sims & Trevor Tierney, back in 1999 at the Vail Lacrosse Shootout just as they were graduated from Princeton University and watched them throughout their pro and team USA years, I can say that these are two guys who can benefit you greatly by listening & comprehending their advice & tips. Incredibly, for free, they have put together a thorough website with words and videos to help guys like you learn the game of lacrosse.
The site has a beginner and advanced section with pages for all the skill groups with videos to display the techniques. Watch and Learn!
Check out this website and learn from it.