Ques. regarding frizz, Revostyler, and Sheer Blonde

Hey I`m new to the board so first I just want to say Hi to everyone. Hi!! OK down to the questions....

I have a lil longer than shoulder length, dirty blonde, curly(10%)/frizzy(90%!!!!) hair. I also swim almost everyday and the chlorine I`m sure is not a big help.

Ques. #1: I have used John Freida and other frizz serums and they make my hair nice and soft, but it is still frizzy!! I`m at my wits end. Any suggestions on shampoo, conditioner, serums, treatments...?

Ques.#2: I`d like to try to get my hair straight but without harsh chemicals or expensive stuff. How do I do that and have it a successful do?

Ques.#3: I just saw the Revostyler on TV today. Has anyone used it and know how it works? Is it worth the $$$?

Ques.#4: I just started putting in A Touch of Sun by Clairol to lighten my hair for the summer. I also am using the Sheer Blonde highlight activating shampoo and conditioner. Is it necessary that I use the Sheer Blonde? Or am I just wasting my $$$?

Thanks for any and all help you can give me!!!