I've been working as a consultant since long before I started my current home chef service.
For me, one of the most important steps in the consulting process is putting together an agreement detailing:
- what work is to be done
- how it's completion will be measured
- what you'll need from the client to complete your work
- what the timeline is for the whole process
- the cost and the terms for payment
Put these together into an agreement and you'll feel a lot easier. The client will then know exactly what to expect from you and won't judge your service based on presumptions. If they need something extra from you, it's a lot easier to approach them with another charge when you have that agreement together. Most importantly, that agreement works as a contract in case they try not to pay you.
One more thing, never accept work doing something you haven't done repeatedly with great results. You do not want your clients to be guineau pigs in your learning. You'll find it a lot easier to find work if you specialize anyways. Restaurant owners look for people who are experts at a particular task, not experts overall.