So I am just getting started in full ASL, moving from ASLSK. What are some good scenarios that play in 4-5 hours and won't be overwhelming to the newb?
I'd start with an infantry-only scenario to get the basics of concealment and snipers down.
Check out some of these scenarios:
Don't hesitate to ask questions of other players and to ask if anyone is available for a game. With VASL, you can play FtF or PBEM.