Bought the Sedu flat iron now what?

I purchased the Sedu flat iron and heat protectant today. I've never used a flat iron before today. My 3B hair looked ok, just ok. What products work best for flat ironing? How do I prevent damage to my hair? How many days a week is it safe to use? How do I get the shorter hairs at the crown straight? I know I'm asking a ton of questions so thanks for bearing with me! Any and all suggestions are welcome.
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to get the shorter hairs straight, use a tiny comb to get them untangled, and carefully put heat on the crown,...sorry i can't really explain that very well lol
i hope this helped :]