@antaja Welcome to Steemit!
The following link should help you out with your doubts regarding Steemit.
https://steemit.com/steem/@msutyler/10-links-for-steemit-beginners-how-it-works-difference-between-steem-power-and-dollars-how-to-add-images-etc

Once you're on Steemit chat, send me a message , I would would love to help you out.