#1 - if you are hunting public ground here in Mo, you can hunt effectively from the ground. You DO NOT want to be stalking deer on public ground where other hunters are likely hunting. That is the best way to get shot. Many of them may see movement and shoot 1st and identify their target later. (not trying to scare you, but we hear the stories every year)
You do not want to hang a lock-on on public ground, and leave it for any period of time, unless you are willing to to lose it to thieves. If you are going to use a stand on public ground, I would suggest a climbing stand. You carry it in and carry it out with you. If you use a climber, you may want to go in prior to the season, to pick good trees in likely spots and trim branches. That way you will have good trees, that you know are ready for you when you get to them for your hunt. You will not have to cut shooting lanes or trim branches on the tree to climb, as you have it done already.
You can also hunt from a ground blind, that is easy to carry in and set-up when you get to your spot. If you know where you are planning to set-up you can cut some cedar branches ahead of time to camo your blind some and add cover scent, as you are more vulnerable to detection being on the ground. When you get there and set your blind just drape or tie these over your blind. If you use a blind, you may want to add some blaze material to it as you are hunting where other hunters may likely be. And you would be at the level they will be aiming.

#2 Many good brush guns out there. I also have a 30-30. Even an old battle axe like the Norinco SKS in 7.62x39 can be a good brush gun. I used one for years. Whatever you decide on, just Practice, Practice, Practice. And always identify your target before you shoot.

Most stands now days come with a full body harness. There are better ones that can be purchased. Just be sure to use one, whatever treestand you may be hunting from. It only takes one fall to cripple you for life or worse.