You need to determine and focus on your target customer groups; who are they, where are they and what do they do?
You need to determine your USP - what expereince and skills can you offer to customers that is unqiue?
Do you have skills to complement you Dynamics skills. Such as Excel or Access or SQL?
If you visit a local business start-up clinic they will talk about price, product, promotoin and place.
Form my experience :
First place is current customers, both end users and Navision partners.
If you can make a good relationship with an end-user then you could attend User Group meetings and find other end-users. Maybe you can use your best customer to help promote your services.
Another option is to advertise.
Another option is to visit local businesses and sell yourself.
Another option is to visit local accountants and business consultants.
For me this is the wrong time to go freelance;