Valheim plus is the first mod you should look for. It has a lot of settings that you can change. Might as well get one mod that does a lot than to get a dozen smaller mods that do the same thing.

After that, look around to see what you like. I'm playing around with ValheimRaft this time around and I think it's going to be a fun one. I can build my own boat and sail around on a mobile base.

I get my mods off of Nexus and use their manager which is called Vortex.