... and i don't know what valuable item can i craft in order to use it for trading? For example, what can i make to be able to buy a bow and arrows? I see that fishes are worthless, wooden bowls too.
Most items need big stacks to be worth anything in the range of bows and arrows. It's simply because bows and arrows are expensive, and most crafted items are not. Additionally, crafted clothes have only 20% of original value. Actually, arrows (normal, not blunt ones) are one of the more expensive things you can craft easily. Ten standard arrows (or ten summer squirrel pelts) cost the same as one standard quality longbow, which is quite a decent weapon.
If you don't have enough cords, then making primitive bow is better. One primitive bow cost 16 units, the same as two arrows, and making it uses single cord, and a small tree. Don't make shortbows - making them takes ages, and you would be better selling the food you consumed in the same time...
Still, probably the best solution in the beginning is making boards. If you see a village with fallen log/tree in it (happens sometimes), you can use it to make boards in place. One board costs 8, the same as squirrel pelt and an arrow. Boards are heavy as hell, but since you are making them in place, you should be able to trade it. You may want to bring them to the house where the intended bow lies, and wait for a villager to come nearby, before picking it all up (in tranches, if necessary) and trading.
By the way, two torches are enough to buy a cord from a villagers. Or collect around 25 fistfuls of berries (some less, some more) and buy a cord with it.
As for fishes, standard quality roasted pike costs about 5.79 bucks, so you need two to buy an arrow. Dried pike costs slightly above 8 bucks, enough for an arrow, but you'll probably start with roasted ones. Roasted trout costs more than an arrow, so it's quite expensive, but it's probably wiser to eat it instead.
For meat, the lowest quality meat (I mean low nutrition, not badly cooked), when roasted, costs about 0.8 bucks per pound, while the best meat, i.e. bear, costs about 1.9 bucks per pound. Most big animals, when roasted, cost about 1.2 per pound, making it a better trade than boards weight-wise - but you need to kill the prey first, and then roast it and bring to the village quite quickly, before it spoils. Most trade I do is from meat and weapon/armour taken from enemies, with furs reserved for travelling merchants. Making items is not profitable in the long run.