trade works mostly by giving the trader (most cities have a designated travelling merchant/trader) your hearth secret in a private message, so he'll be able to find you for trading. if you know your worldmap location, tell it to the traders in a private message - this might be easier than pathfinding to your location by hearth fire.
do NOT post your hearth secret on the forum. do NOT post your worldmap location on the forum - this will just invite thieves and griefers, even if there is nigh nothing to steal or destroy.
fish is worthless for trading AFAIK - any village will have better fishing gear and therefore better fish. chantrelles and blueberries might work, but you'll need to gather larger amounts of them first. same goes for inkweed. cavebulbs are good for trading, but you'll need decent perception * exploration to find them, and one of the night-vision-enabled custom clients to make long cave walks less of a pain.
stone axe does nothing to help you. until you plant or find better trees, you'll get q10 blocks of wood regardless of carpentry skill and axe quality

slings were nerfed in yesterday's update - their damage is now always the same regardless of quality. you might as well get your own hemp or flax going and grind survival and marksmanship until the developers set any quality-damage-relation up again.
you might get a bone axe for free just by asking nice - after getting the metal ones to decent qualities, bone saws become almost obsolete.
"Если не я за себя - то кто за меня? Но если я лишь за себя - то что я? И когда, если не сейчас?" Хиллель Старший.