Good advice and knowledge here for sure!
I prefer a 6wt fast action.
A moderate action 6wt with a Smallmouth bass line will give you plenty of power to land a large specimen, while still allowing plenty of sport for the little guys.
I use Rio's smallmouth line, (6WT Floating). The bass taper shoots large, bulky or weighted flies with ease. ronk spelled out an important point, casting with a double haul method.
Get on youtube and look up flycasting. casting is a skill and you will need some practice. hauling, mending, reach cast, roll cast. There are too many to learn all at once. focus on the basic cast at first. When you pick up the double haul, this cast will allow you to overcome windy conditions, as well as making large bugs easier to cast.