There's a perk much later where you can trade what you want, but for now, you have to figure out what the merchant you're trying to sell stuff to has for sale himself. Nonetheless, I will provide trainer information in case you decide not to heed my advice. You can only sell weapons and armor to weapon merchants, potion creating ingredients to potion makers, etc. It is costly and there are better skills to waste your money on considering how easily smithing is trained given the aforementioned method. Note: For smithing, in particular, I do not advise you to use a trainer. I will not provide all trainers, but instead provide the most efficient and easily accessible trainers only. If you train smithing five times, you cannot train enchanting until you level. This means that at any given level, you may only train any combination of skills five times. Trainers can be used a maximum of five times per player level. I will now provide detailed information on how to locate trainers who will charge you to automatically level up a skill. You will save a lot of time maxing your character out if you train these two skills simultaneously. Always pick up items while on your quests and sell them in town so that you have some funding for training this skill. Because smithing can drain your gold, play the game and only train it when you’re conveniently in a town.

Try not to get carried away improving this skill.

Make sure to create your leather bracers before you work on your personal items, though, so that the equipment you use will be made with the highest skill possible. Most towns have a general goods merchant, blacksmith, alchemist, and innkeeper.

Always buy the supplies you need to create your armor and weapons for personal use before wasting your money on leather. I would suggest selling to multiple merchants in the same town.

Where to sell in skyrim