Welcome to Rib.net.
Might be worth a call to the Mounbatten Centre - they do power boat training on RIBs.
Absolutely right to do some training and having safety & happiness afloat at top of the priority list & see whether you enjoy RIBs - the training would apply to any power boat if you decide a rib is not for you.
Do consider what you want out of your boating - coastal cruising, fishing, beach hopping, where you want to keep it - afloat / on trailers etc... and whether you want a rib or a hard boat - defining the boating you want to do will shape that decision. Also consider age of children & what they and Mrs 2vans want / will enjoy.
Don't be in a rush to buy, and do trial anything you're thinking about buying.
Member of the Macmillan Round the Isle of Wight Club