I've had slings on my rifles over the years. I say leave it off.
Unless you're taking a class that requires it, or your carrying your gun all day, you're better off without it. They get caught on things and just generally get in the way. It can be used as a stabilizing tool for long shots, but it's not necessary for that and would have to be considerably shortened.
I've used single point, two point, three point, adjustable, fixed, leather, nylon, neoprene and some others I'm sure. If you're not carrying for a while, they're all pointless. I install them when taking a class and then remove them once home.
Alright, enough bashing...
If you just have to have a sling, start with a 2 point. Single point slings are very tacticool, but they put a lot of pressure on your neck or trapezius muscle. The 2 point spreads the weight of the rifle out over your back. This makes them much more comfortable.
If you think your rifle is light because it only weighs 6.5lbs, think again. After carrying it all day or even just standing with it for a couple hours, it gets very heavy. So, again, the 2 point sling is better.
The three point sling is interesting, but overly complicated.