I need to boost up my pets intelligence and strength, but how do i?

You can boost it's intelligence by reading books to it, and you can increase it's strength and other stats at the training centre. c:

how do you get books? im new you see, i dont know much!

There are a few ways to buy books, you can buy them from other users, you can buy them from The Book Nook, you can also vend for them using Wizard Tokens at the Blue Sky Vending Machine in Veta Lake.

you can also get intelligence from playing the game Mystic Spindles.

- just another tidbit about books, you can only read one of each book to your pet. So, don't bother buying multiples of the same book like I did when I was new. :) Hope that helps!