Need some recommendations please - first timer

Experienced fisherman but little knowledge of fly fishing.

Going to buy a fly rod this weekend need some opinions on what you guys are using. Plan on fishing redfish, trout, whiting, flounder and whatever else. What weight do I use?

I also plan on fishing trout in N. Georgia so I really would like to get something middle of the road so I can fish in both places. I am thinking 7wt but worry that will not be enough for the lowcountry but too much for North GA. Thanks in advance.