I think that apart from the player driven market for the more developed items, like high quality weapons and armor, there should also be a NPC market for all the simpler objects, and possibly also for some of the intermediate stages of a product. If you can sell the stuff you make for tokens and/or TP, it will add to the motivation of choosing crafting as one of the options to advance your char.
By crafting those simpler products, you'll be able to raise your crafting skills to a point that is necessary to create more advanced products (weapons and armour with stats and innates), which players will potentially be interested in buying. But also for these advanced products there should be NPCs taking the items off your hands if there are no interested players.
The price will be dependant on the quality of the item, whether the buyer is a player or a NPC. The quality will in turn be dependant on the materials and the skill of the crafter that made each part of an item. But even if the result is not perfect in any or all of the aspects, there will still be a buyer for it, so your work will not be wasted.
Setting up this NPC market should in my opinion be the first step on working with the craftskills, and it has actually already started with some of them.
Textileworker
The existing market for linen thread and cloth will be expanded to also involve wool, silk and cotton thread and cloth, and also finished garments. The customers will mainly be Clothes Shops, Millinaries and Armourers. In addition Wharfs and Ship's Chandlers will be buying hemp twine, sack cloth, ropes, rope ladders and sails.
Leatherworker:
There is an existing market for raw animal skins, prepared skins and tanned leather, where the NPC customers pay more the further developed the object is. This too can be expanded later.
Livery stables and Petshops would buy saddles, bridles and dog collars, various Clothes shops would buy shoes, boots, gloves and furcoats, but the main customers would of course be the numerous Armour shops.
Woodworker:
For instance Lumbermills already buy tree trunks, but would also buy planks, poles and staves, NPC Weaponsmiths could buy bows, arrow and wooden handles, Wharfs could buy rungs for ropeladders, but also boats and ships. Breweries could buy barrels, Furniture shops cabinets, Artshops wood carvings, and farmers would buy timber and fence poles
Stoneworker:
Forges and Blacksmiths would buy coal, NPC Carpenters, Masoners and Contractors would buy stone blocks, bricks and mortar, armorers would buy roundstones for pommels.
And there would be a huge market for both cut gemstones and glasswork - not just jewellers, but also weaponsmiths, armorers and artshops would buy these.
Metalworker
There are already recipients for ores from the mine, and these would pay a bit better for alloys.
Livery stables, Farriers and Ranchers would buy horseshoes, Carpenters and Contractors nails, Farmers barbed wire. Tailors and seamstresses would buy needles and knitting needles, and some of the tools used for other crafts could also be produced by Metalworkers. But the main product would of course be various kinds of blade weapons, mostly sold to weapon shops
