MySQLi SB is actually one if the most recent (if not the most recent) addition to the WA stable and I have to say one of my favourites!
I think you'll find that most people with queries about it just add to either this category (as you have done) or to the mire general one DataAssist (found in the Databridge section).
Re the support, the help in the forum us second to none and usually amazingly quick turnaround within US hours.
The tutorial library is extensive, granted its not complete, and is populated by both WA and actual users.
I understand how you feel as it must be daunting 'where to start' but if you have a specific issue or question, post away and someone will be around the corner happy to help!
Enjoy and all the best