Fencing - I would have a number of concerns over fencing 5 acres with the goal of keeping dogs in and animals out. I've built a lot of fencing and it is very hard on such a large scale to keep it close enough to the ground that animals won't burrow under it, going or coming. Also, fencing with the aim of keeping dogs in and deer out will be a very expensive endeavor. I would stick to the 1/2 acre and then go on leashed walked over the other five. If your dog is well trained, then they can be unleashed in your presence. Also, a t-post fence tall enough to keep deer out is very prone to blowing over in the wind with that much weight that tall. When we put in a t-post fence, we make every 8 to 10 posts a stout wooden one set well into the ground to anchor everything. Another thing to consider is that with every fence, especially woven wire or chain link fence, weeds will grow up right next to the fence on both sides. It requires a lot of string trimming or chemicals to keep them clean because you just can mow close enough.
Flooring - For floor that will be abused, nothing is better than solid wood flooring. We have installed it throughout our main floor living areas. Although I would consider it a DIY project, it does require some specialized tools and skills. You need to have access to a stapler/nailer and a vibrating multitool is great for notching under door trims. Where I see most people fail is not getting things straight to begin with and then fighting gaps the entire project. LVP has it's place though I don't think pets is one of them, especially ones with claws. It scratches, just like wood, but you don't get the chance to refinish or repair scratches like you can wood. I'm laying LVP in my basement finished rooms right now. It is my first time to do so and I must say, laying down hardwood floor is much easier. With LVP, especially a floating floor installation like I am doing, it has to be perfectly straight and there are tricks to achieving that but I didn't think it was obvious. I did what I did when I started laying hard wood flooring and failed miserably, having to take it all back up, watch more YouTube videos and succeeded the second time. But laying it around doors was extremely problematic as I couldn't lift the plank up to get it to lock. Instead I had to lock it away and tap it into place from one end. For places I couldn't even do that, where I had a notch cut around a door jam, I had to remove the entire door jam to get it into place. It was a lot of work!
Wells and Septic - For the well, I would get it tested just to see what you have as far as chemical concentrations. There are a number of places from state run (free) to private labs (pay) to get samples tested. Once you know what you are working with, then you can start researching solutions/maintenance. For septic, I'm guessing it was probably tested as part of the sale, or one of the provisional things remaining before the sale is final. Generally there isn't too much as far as maintenance other than to pump the solids out once every 3 to 5 years. How often depends on the size of the tank, style of the system and number of people in your house. We get by with closer to 5 years but we also have a more elaborate system than most in our area as we have an additional aeration pit stage between the main tank and the leach field to further digest organics.
