newbie who needs help!!

So i'm obviously a newbie and i need some hair help. I have naturally really curly hair((exactly like Tia and/or Tamera Mowry the twins from the show Sister Sister))  and I love it i really do but sometimes i want a change. It doesn't help that i'm one of those people who gets really bored with my hair and likes to change it up often. I don't have the money to go to a salon every 2 weeks get my hair done or even every month for that matter. So anyways I was wondering if anyone had some good tips to get my hair sleek and silky straight. I have read stuff about the japanese straighting and i can't get that because i simply can't afford it. I am talking about straightening with a flat iron. I have a nice expensive one but my hair is sooo frizzy and limp after i straighten it so I was wondering if anyone had any good tips or product advice for me.

Thanks

yeah my hair is washed, conditioned and dried. I use avon stuff but it's for wavy hair not curly((i didn't realize that before I got it)) I also use smoothing blow drying gel by Thermasilk before i blow dry my hair. Then after i blowdry it i use a flatiron.

Hi Candy.  My hair is a lot like Tia and Tamera's also so I know where you're coming from.  You definitely don't need a relaxer or that Japanese straightening thing to get your hair straight.  You just need a good flat iron and heat protectant.  I  have a maxiglide flat iron and I can get my hair bone straight like I have a relaxer and it stays that way until I shampoo it out (as long as it's not humid).