What features are looking for in a sling.
Do you want a traditional setup that is on the bottom of the rifle for just carrying? For this I suggest Tacticool22's solution or something along the lines of
this sling mount with
this basic sling. Install the mount on the bottom side of your hand guard towards the front and connect the sling. On the other end, route the sling through the sling loop on the buttstock's toe if you have a basic model or through one of the slots on the buttstock if you have the MOE edition.
Do you want a more tactical setup where it's mounted on the side? For this there are a plethora of options and it would be difficult to suggest something without first asking lots of questions. The only way to narrow it down is to find out what type of shooting you will primarily be doing and how you want the rifle to handle and hang on your body. Do you want quick length adjustment? How about quick disconnect? Would you like a hybrid sling that can be used as both a single point and 2-point? Do you want padding?