I am interested in getting a couple Brushless SC18's for my family. But I have a lot of questions and need a lot of advice please!

What is the highest KV the stock ESC will be able to handle? I think I would want to upgrade the motor pretty fast and looking at the reedy 7000kv or maybe higher. - what pinion and spur for that? How long will the run times be with the stock batteries?
Or what is a good/hopefully cheap motor kv that is really fast - and what gearing should I use - pinion and spur

Are front and rear tires the same? Is there a variety of tires to choose from? Where can I get tires?

What are some recomended hop-ups? and where can I purchase these?

I have a lot of 1/10 scale tools, will I need to get different sized tools? What kind would I need?

Are there any parts that break easily?

I would like to make one big purchase fast and get it out of the way and have these as soon as possible.
I have no good LHS around here.

Please, any advice helps a lot!
Thanks,

Zac