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And also how can I start earning here? Would the best way be start just blogging on a niche? Or can I do it by commenting in niches I’m familiar with and have good answers or the right answers to people’s questions etc? As I can’t find a guide area on this website :/ o.o

Please check https://ecency.com/faq page, commenting, posting any form of engagement has potential to gain you more followers and votes.

More Hive Power you have higher your vote value is, but you don't need to have a lot of Hive to start engaging and earning. Percentage slider is allocate smaller portion of your vote, when you have more Hive power you will notice slider will change value you will potentially be rewarding author with.