Welcome!
A few us have or have had Libertys but mostly as daily drivers. I think a few people have taken them off road but not many. There are a few things you can do such as bumper/winch upgrades as well as suspension. Unfortunately, there isn't a ton of aftermarket products like there is for TJs or XJs.
The stock bumper is plastic so you will need something to mount your winch to. A few companies make Libby bumpers like ARB. You may be able to get one fabbed up as well. A straight replacement of the bumper should not be to difficult.
As for tires, you won't be able to go much bigger than stock I think unless you are looking at a lift. That being said, there are alot of trails that can you do stock in McLean.
Having the right gear to pull yourself through obstacles will help alot. Sounds like you are going in the right direction there.
My only other suggestion may be to really look at the limitations of upgrading a Libby and the price of those components (it will be more expensive) versus keeping it a stock daily driver (and reliable) and getting a used TJ or XJ for wheeling. No one in the club wheels a Libby off-road right now so you may not find the expertise you need. I have found it difficult to get find answers about Libby's online.
That being said, I would love to see a Libby wheel with us! Be different and show us what you can do to your rig.
To join us on an open run,we really only require front and rear tow points. There is one next weekend that will be stocker friendly. We also have a meeting coming up in a couple weeks. Come out and see what we are all about.