I guess you have the basics having shot pistols and shotguns. But a rifle is different. I suggest you buy a middle of the road AR and a lot of ammo and practice, maybe take a class or 2. At least buy some DVDs and watch videos, read a lot.
The way I was taught to fire the M16 and the way it's taught now are completely different. The old way is called chicken wing and is not the best way. The new way looks much better but is designed for wearing body armor. I will have to modify it and make my stance personal yet incorporate the newer methods. I am at least a few months away from my first purchase of my own AR. Find out what is correct and comfortable for you, buy a lot of ammo and magazines and go to the range and practice. Get your stance and you system down, it's about muscle memory. It's about doing the same thing over and over again the same exact way. Make sure you are doing it right the first time, it's harder to fix things once you get into bad habits.
Make sure you know how to clear the weapon and the proper sequence for malfunctions. I don't remember all of them and it's something I have to brush up on. Practice that too. Do all that until you can do it in your sleep. Practice until you are a proficient shot. Learn about the ins and outs of the system and what every thing does. Once you have all that down it's time to get a better rifle. Also learn about the different types of ammo so that you can figure out what ammo is best for your needs. All weapons respond differently to different ammo and it takes some time to find out what your rifle likes as to get the most out of it.
As for recoil, it's not that much, like a push on your shoulder. Look into a good rifle for about a grand. You can't go wrong with a Colt LE6920, best bang for the buck and most people will agree. Best resale value and you get a good rifle out of the box. No questions about mil-spec or quality of the parts. Once you know all the companies and the difference between commercial and mil-spec and the different materials used you can put together a specialized rifle for your specific needs.
I'm not a new guy in the sense I have worked with the weapon in the US Army. But this was a long time ago and I never owned my own, I will very soon and hopefully more than one. So I have done a lot of research on the rifle over the past few months.