I'll start with Forza cuz it looks cool and car go vroom - I'm much more casual when it comes to racers currently anyway and tried and liked it before, so we'll see.G920 is more than good enough to get started.
Don’t expect good FFB from games like Forza though, if you want to get most out of it games like Assetto Corsa, ACC, AMS2 are best options for someone new to a wheel.
AMS2 is a title I haven't tried yet but will in the future too. Lucky for me I can pirate before I buy so I have that as a bonus.