I have to ask, what killed it? Also, you should understand that Bermuda, this time of year, is naturally brown. It'll come back when it gets moist. So if you killed it (not intentionally) by not watering it, just take a deep breath and wait until spring. Is the grass GONE, or just brown? If it's gone, then that's more serious, and one would have to wonder whether what killed it is still in the soil.

Here's my 2 cents :-)

What happened to the bermuda? That stuff is hard to kill even with Roundup. It goes dormant if not watered but usually greens right up with water. You can hit actively growing weeds with weed killer if you want and there are just too many to pull out. Newspaper and mulch will work if you are creating beds or trying to add organic matter before sod but only if the bermuda is truly dead. It will laugh at your feeble attempts to smother it :-)

I like organic fertilizer and use alfalfa pellets from the local feed store. I spend about $12 for fifty pounds and can do my entire yard twice with that bag. The pellets are too big for my spreader so I just fling them with a dustpan liberally over the lawn and gardens, then water. Smells good and completely safe for everyone. The fall feeding is the most important of the year.

The saplings may respond to round up in a zip lock bag, just tuck the sapling into a bag, pour on enough RU to saturate and leave it. I used this method to kill trumpet vine. It will drink it up and hopefully kill the roots. There is stronger stuff for stumps and brush too which is sprayed or painted on cut wood. If the stump is really large, you can drill into it and fill the holes with stump killer. I've also heard of pouring white sugar into holes but have no experience with that method.

I hope you take this advice in the light-hearted attempt at humor that was intended.