Hello and welcome to naturallycurly.com!
I'll try to explain some of the basic things of the whole "Curly Girl" (CG) philosophies of Loraine Massey. Basically in the book it recommends using conditioners to clean hair.
You're probably thinking, thats ridiculous!
Well, truth be told, movement is actually what removes dirt. The only thing that shampoos are able to do is create a lather and allow you to remove oils. Shampoos are necessary for removing oils on your scalp and other build up, but most people on the board either follow these rules or attempt a modified routine of shampooing with non sulfate shampoos every once in a while. Sulfate ingredients are common in most shampoos and very hard on the hair, shampoos with only cocamidopropyl betaine and/or Decyl Glucoside are much preferred here. I understand that these ingredients that are less harsh are used a lot more in Europe but I can't guarentee this at all.
One more thing about CG!
There are products in conditioners known as silicones. They are practically liquid plastics that coat the hair and make it look shiny even though it is damaged because it coats the hair and makes a flat surface so that light can reflect off of it. This is good until you consider the fact that removing these requires the use of a shampoo sometimes more harsh relative to which silicone. If you do CO Wash (conditioner wash) make sure there are no indredients that end in cone, on this board silicones are referred to commonly as cones. Anyway if you CO Wash these will cause build up and it won't end well
As for deep treatments and natural products, there are certain things that you can probably find in a foods store or a natural type store that would work wonders on the hair as a deep treatment. Coconut oil is one that I know is supposedly a good oil for a deep treatment. Shea butter is another. If you're looking for actual hair care products to use, Jessicurl makes products that most people on this board love. People also love the Devacurl line, as that is Lorraine Massey's line. She offers a product called no-poo that is like a conditioner but has a zero lather cleanser so it is extremely gentle but acts as a conditioner. Oh if you go to www.jessicurl.com
theres a section where it says you can get the products internationally.
Generally you could do a deep treatment with a normal conditioner, put in a lot, i mean really saturate the hair, then diffuse the hair for 30 minutes. I hope I summed this up well enough haha. I'll let other people fill in the blanks I missed and make more recomendations. Oh one more thing, don't expect to see great results right away, it takes time for the hair to get better after heat damage. As a matter of fact, straight irons are the most damaging thing for hair pretty much other than chemically relaxing, although you will be able to make your hair a lot more healthy, it won't be able to be nearly as healthy as it will until new hair grows in that was never put under the intensive doom of a straightening iron.