General guidance on pricing goods, services, and balancing economy

As I’m making my way through a campaign, I’m beginning to realize that I don’t know what to do about money. My tier 2 (out of 6) players have 200 shins (gold in Numenera terms) between 5 of them, we don’t know if that’s a lot or a little, and we stopped caring about money altogether – finding monetary rewards is not exciting, and money is not a motivator. I’m trying to price and offer some goods and services — which will create the desire for players to spend (and acquire) wealth.

Is there some generic guideline against which I can use to price things? I think I just don’t have a good gut feeling how to price hiring a group of guards or a spy for a month vs a sack of grain or price of a sword.

How do I begin to estimate price of goods and services? Are there good resources to help me?