Certainly agree with Persifal. My first model used poster paints, which fell off in an hour
Back in the 90's nothing really online to help, but today you have youtube, facebook, WarhammerTV even. Few minutes each evening painting along with any number of talented VLOG painters should crank up your level.
Another is having the lads around for beverages and a session painting some NPC's or bulk batch for one of the groups armies also provides a great source of inspiration and skill trading.