That's a great little kit to start with. It was one of the very first ones I did when I got back into the hobby.
Thank you kindly.
Most kits don't come with an included wiring kit. Polar Lights only released official wiring kits for only a few models, otherwise what you're seeing are wiring kits from unofficial "garage businesses." I don't have any experience with these, but I generally hear nothing but good things. I usually light my models with LED string lights. The only official wiring kit I used was for my "Discoprise."
One thing to keep in mind is that not every kit is designed with lighting in mind. In the case of the 1/1000 TOS Enterprise, all the windows are decals, so if you want your model with lit windows, you're going to need to drill them out. This can be one hell of a task, depending on the kit. DS9 almost killed me.
Here is a link to a great sight that sells a great many lighting kits, aa well as many other accessories and models themselves.
https://www.culttvmanshop.com/search.asp?keyword=Lighting
Depends on the model and depends on the builder. As for colours, there's a great many reference sites that can help with that, but I believe this might be the most helpful.
https://culttvman.com/main/a-modelers-guide-to-painting-the-starship-enterprise-pt2-by-gary-kerr/
Definitely. Have fun and remember that you're not going to make a masterpiece the very first time. You're going to make mistakes or something is going to go sideways. Push through it, take your time and finish it. I find that I get better and better with each build.
Good luck. Hope this has been helpful.