long frizzy hair

hello I recently purchased a straightener for my hair I have very thich very coarse hair that is in deperate need of some TLC. My hair was killed by the sun in Cuba during my holiday and I had it permed a year and a half agoI am lookinf for a more mature stle but I do not want to go any shorter then shoulder length.Can you reccommend a style that would help it get healthy and get rid of the frizzies. I use religiously hair products Nexus Botonoil,Cat Redken,Joico K-Pak Just to name a few.Thank -You -