I have written 30 orignal stories. 20 are short and 10 long. The plan is to have 5 short stories in a book (4 books) + 1 book per long story. They are supposed to be picture books for ages 8 to 12. How do I find agents? How do I get published? What will I be paid?

This is how you do it. Go to a book that is the same genera as the one you want published and look for the address on the page where it says the copy write.
Then write a query letter saying your name, your inspiration for the book, and what it is about. Also enclose the first few pages of your manuscript, and a SASE (self addressed stamped envelope) put it all in an envelope and send to publishers. DO NOT SEND TO JUST ONE! If the publisher likes it they will send a letter in your SASE, requesting your whole manuscript. It usually is not worth it to pay for a company to publish your novel.