Welcome to the forum and the ancient sport.
Anytime I find a new hobby I have a tendency to want to dive in and buy way more than I need or know what to do with, and I've learned over time that I'm better off using what I have until I see that it can't achieve the results I want.
What I recommend is to fish with what you have already - and knowing exactly what you have will help others give more specific advice. 6'6" rod length is what I started with (Medium Light Berkley Cherrywood HD and a cheap Shakespeare reel) and it served well for a variety of species - particularly crappie and trout). It wasn't until I started specializing in certain techniques that I realized I would be better equipped with different setups. For bass I default to a 7' Medium Fast spinning rod (13 Fishing Blackout - I have 3 of them) combined with a decent Lew's or 13 Fishing reel for 95% of the time. Of course some lures/techniques will be ill-suited if you actually do have a Medium power and slower action rod (don't go throwing an A-Rig or frogs). Fish what you're able, such as swimbaits on jigheads, wacky rigs, drop shot, in-line spinners, etc.
IN MY HUMBLE OPINION, the rod is the most important factor of your setup. It plays the biggest role in terms of casting distance, casting accuracy, good hooksets, etc. The next most important element is your line. Mono is great. I prefer braided main line with a mono leader for better sensitivity and castability. In third comes your reel. I feel that as long as your reel has a decent drag and it holds enough line very little else matters.
I think for you to determine what you want to buy next (let's just be honest, it's probably going to happen) you should try getting a good grasp of the basics first and figure out what YOU enjoy fishing - which techniques, lures, styles. I LOVE fishing weightless flukes, drop shot, and top water. But I didn't start with any of those. I found out through experimenting and spending a lot of time on the water and many days getting skunked.