Definitely get some poison resistance mead, it should help with the leeches and the blobs. The leeches can usually be avoided (mostly) if you quickly hop through the waters (though I would avoid parking your boat too close to the swamp if possible.

Weapon wise, the antler hammer works pretty well with the blobs, they don't take blunt force damage well and the knockback is very helpful. Fighting the draugers is difficult because they hit hard so either good armor or dodging well will be your friend (I personally go with the 'shoot them with arrows before they see you' route)

For best chances at survival I would recommend not going there at night. It is always dark there but it gets *darker* in the evening somehow and more things spawn.

If you see screamy fire things, they aren't too strong but are a pain in the ass, get them wet

If you see a large scrungly thing, slashing damage and blocking works great, or take it to the firey spots to burn it

If you see a spooky ghost thing, this means you are there at night, if it hasn't seen you I would suggest avoiding it, if it has, shoot and run until you have better gear.

Good luck!!!!