Howdy. Welcome to Saddos.

It's possible that having a MA background will help you pick up the moves more quickly or you may have habits that are hard to unlearn.

There are a number of clubs that open at weekends, some just focus on fitness and bagwork. Some have junior classes others will let you all mix together. If you are really pushed for time perhaps one of the clubs allow you to take private lessons and ask them to focus on technique?

There are some clips of pros working on heavybag knocking about on youtube if you fancy a look (can't search at the moment).

Every club is a little different so it's best to ask round.

Whereabouts do you live? Maybe someone could recommend a club.