[VK810] Need help modifying tablet and other questions topic

I have the LG G Pad 8.3 LTE model (VK810) running on 4.4.2 and I managed to root it with the bruteforce method from stump root. I have SuperSu loaded on the tablet. I tried doing some research about the tablet on my own and ended up with more questions than answers from when I started, so now I'm asking for help. I'm still a little new to everything, so forgive me if I ask anything too obvious.

1. Are there any ROMS available for my device? I think the answer is no, but I want to make sure of it. I wanted to start clean by removing all of the junk apps and programs preloaded on there.


2. The LG OTA update keeps asking me to update my tablet. I'm worried the update will disable the root. If the update does take it away, is there anyway I can disable the constant reminder or should I take the update?


3. Should I bother trying to load TWRP on it? From what I have seen, people have had complications with it since 4.4.2 is not supported on my device.


4. If I can't start clean, what apps let me delete any apps that I want to? This question is generic, but I'm still confused as to what the best method is.


5. This question isn't as important as the others, but how do I put new apps in alphabetical order? It's not automatically doing it.

I appreciate any help that I receive. Thank you.