Not sure how long its been since your pasture has been turned/disked/worked, but if it's been a while, I wouldn't disturb it. The more disturbance, the worse, from a soil health perspective. Takes a long time to get your underground critters properly established. Turning layers burns up that organic matter, effects infiltration rates, and can create hardpan layers. I would highly recommend a soil test, if you haven't already done that. pH would be the first thing to correct if necessary. Best dollars spent hands down.
Ryegrass can be a helluva winter forage, but it will stick around and compete with your bahia grass in the spring. I would plant cereal rye or oats. Oats better for the cows...cereal rye will head and get out of way for bahia to come on quickest.
I've also used red river. Got it for $5/lb. last year. Planted with a cultipacker/seeder at 4-5 lbs. per acre. It is tremendous feed, and will re-seed, but needs moisture and some fertility to flourish. Better for stockers...but bahia has a much longer season and is hard to beat in south georgia for brood cows.
I rarely, and i mean rarely spray herbicides for anything, but did a few years back dealing with Horse nettle. Pulled out the big gun, Grazon PD. Killed all broadleaf weeds in pasture. The next year, very little Horsenettle, but my arrow leaf sida (tea weed/ironweed) dominated EVERYTHING. The following year, my horse nettle starting creeping back in. Cows will bite the tops of the Sida, but they aint too interested in the horse nettle, for obvious reasons.