It is possible to blow dry it straight after a shower while its wet blow dry while using a brush continuously through your hair low heat works good. But if "products" you mean chemicals like straightening creams avoid those due to sensitive scalps when exposed to these creams can cause lose of hair and damage. You can use a straightener low 24 heat setting. If your hair is too short for a straightener try the 2 brush technique which you can find on youtube. Hope this helps
depends on how curly your hair is. mine is rather tight ringlets, so i find if i braid my hair after i wash it, when it's still wet, when i take it down, it's only a little wavy. As far as a flat iron goes, multiple go overs on small sections with medium heat. just dont fry it.