Crafting can be done as part of a Long Rest or a Short Rest. In order to craft you will need four things:
The Proper Tools: Every craftable item will have a list of tools required for that items creation. This can be checked on the item as it is listed here.
Coinage/Materials: To complete an item you must either contribute half the items value in either materials or silver. If you contribute 10 silver in value as an activity, 5 of that must be paid in materials or coin and the other 5 silver value is added freely.
Knowledge: You must have (or be able to easily obtain) the knowledge required to craft an item.
Time: Through rest activites you will contribute to the value of an incomplete item.
*Once half the items value has been created through crafting, a player may "buy out" the rest of the item with silver to complete the item early provided they have access to purchasable materials.
**Masterwork and Magical items may require specific materials or schematics that may be difficult to find. Check with your Game Master if you are interested in creating these weapons for more details.
***The difficullty of checks related to crafting an item may vary based on the items complexity and whether or not it has any magical properties.