How to get into hunts?

[Darkstride]

Is it worth to do those? it seems like a really small reward

Yes. Unless you track the open world hunts, the dailies are atleast consistent. And you don't just get one mark per tier. For instance, tier 3 will give you 5 hunt marks and reward 15 seals each. It adds up quick, and while you are doing the daily hunts you can keep your eyes open for A and S Ranks (although S Ranks are unlikely, most of them have spawn requirements).