Hey and welcome to HnH

I think the server could handle quite a few more players. So that shouldn't be an issue, bring 'em all on!
As for the experience, it highly depends on the kind of player. This is a permadeath game with high investment characters so it attracts people who love PvP quite a bit. Thoise can be a real pain for other new players as a newbie running around in the forest is naturally the easiest target for them. Easier than sieging a brickwalled city for 24 hours.
But there is of course other folks too that like to build, socialize, create interesting projects and other things. The game runs a lot on paranoia though because you will never know what the stranger that just entered your screen is going to do to you.
General rule of thumb is that it has gotten more violent over the years though...
So I hope that does not scare you off. If I were you I would read up on general guides about how to defend yourself, get a palisade up, claim your land and also prepare for unpleasant experiences and deaths until you have learned the ropes.