Sorry if these questions have been asked previously...but I'm born again on PC (Haven't played since NBA LIVE 2000

I'm trying to learn as much as possible on my own (Googling things, watching YouTube videos) on how to install and run mods properly...A lot has changed in the past 20 years! Like what the heck is Steam? Lol
In all seriousness, can anyone explain why my courts look like this? I am downloading these files, dropping them into my Mods folder and the screenshots I see attached with these downloads don't look like the screenshots I have included in this topic.
Another issue I have is that every time I select a team to play as with an alternate / city /earned jersey, I can never get the matching hardwood court either, it just defaults to the home court. Has anyone encountered this?
Lastly, I downloaded NBA 2K Tools and followed each step, re-named certain things as required and when I try to save roster, it shows that it saved. However, when I load that specific roster, it just defaults all my changes like they never existed in the first place? Why isn't there a save option on the NBA 2K Tools app?
Shout out to all the modders who take the time to be creative, detailed and upload these variety of dope files. You guys are the reason I abandoned playing 2K on PS4!
Thanks in advance and I hope there are some helpful people in this community who can help an old fart like myself get up to speed!