I would say for tools, the absolute most important are:
Good sprue cutters (they make a huge difference with small parts) i have the fine sprue cutters for plastic from tamiya and theyve lasted years
Angled tweezers that are very fine and wont fling pieces into the atmopshere.
Then of course sanding sticks (tapered ammo by mig ones i think are the best) and good paint brushes. If youre going to be brush painting in totality or even just small details, buy fewer brushes, but buy better brushes and take good care of them. Clean them often and they can last a very long time.
Tamiya extra thin and tamiya mark fit strong for decals. You can get other decal solutions, but seeing as tamiyas is just 1 solution, it is just more simple to start with i think.
Lastly a hobby knife. I used only a hobby knife for years instead of sanding sticks. Its easy to be overly destructive with a knife, but if youre calm and patient with them they can be just as good and of course have their uses elsewhere.
This is all you need to get started. Once you start getting into it, a precision drill for kits that require you to drill out small holes, photo etch scissors and metal files for sanding PE, stuff like that you can acquire as you go and is not neccesary, but is nice to have.
As for paints in general, its gonna depend on what you typically build, aircraft, armor, german armor, ships… If youre just getting back into the hobby, id look at a older morr basic tamiya kit that has very few colors and buy what is neccesary for that kit. The body color of their panzer ii for example will be specific for that kit, but the flat black, red brown, mettalic grey and other basic colors will and can be used on every single model after that. Then you dont have to drop hundreds on paint on day 1 too.
Hope that helps. Happy to answer any other questions or course