Mainly some advices about how to handle dice reduction. For example my character had bad luck and his physical die went down to D4. I use other dices but as a GM sometimes you'll need some ideas to be creative.
May sound stupid or obvious but to survive longer i suggest to run away (or retreat to the back) when Stamina is depleted. Combat is not a sport. :)
You are not supposes to test or consume Ability dice often. It’s like taking heavy wounds or something.
Also, if you can’t afford heavy armor, shields are good to get more sustain (+1 armor and one “out of the jail for free” ticket).
Also keep in mind that PC’s can easily recover Stamina with short rest. Party should begin most of the fights in good shape at least but sneak around or outsmart enemies is even better!
For buying/selling purposes i’m using OSE item and gear tables at the moment (but every other OSR game should work as well).