Apply to become an official SM Item Artist!
If accepted you'll be asked to sign a contract. Payment is 1k tokens per accepted item, you'll be given hints, tips and instructions on how to get there.
A bonus of up to 5k tokens may be given for items of very high quality, with many variants and so on!
Finally a secrecy bonus of up to 3k may be granted for items communicated with us and us alone.
In most cases for a good quality item with several tiers (not a module) you should expect about 3k~ tokens. This should be something you do because you enjoy it, not purely for a reward. Most items will be rejected.