1. bring a hoe to raise paths in the swamp to avoid getting bogged down in water, easier to fight, and avoid the leeches
2. At first I used the stagbreaker to kill the leeches. but I find bow and arrow much easier.
3. poison potions and stamina are needed
4. Most things in the swamp are killed with clubs. That and a bow wiill do you just fine
5. Bring a pick axe or two. Once you get into the cryps to chip away and get the iron.
6. Collect as much entrails from the Draugr, blood bags from the leeches, thistle will be key for ingrediates like sausages, and ...
7. FOR THE LOVE of GOD, if you find turnips.... rejoice and make sure you plan them right away, as Turnip Stew is a great mid game inito late game food.
8. Armor choice can vary. I prefer Troll to bounce around the swamps, no movement penalty, but have the best shield and club you can get. And make iron pickaxes, club and iron shield as soon as you can. I usually skip over bronze armor entirely