New Access User Needing Direction

I am a novice user trying to set up a db for small business and am needing a little direction. Most of the company's sales come from the contracted work for remodeling homes; however a small amount of sales are over the counter sales within their showroom.
How do I set up the db to track the following: customer info, contract sales amount & date & payments & balance due, labor costs by employee and sub contractor, materials costs, and net profit from contracted amount vs deductions of costs?
Payments made are directly related to contracted sale and not labor or material costs; with the exception of the over the counter sales. My boss currently tracks the above info in an spreedsheet ... please advise. Any help will be greatly appreciated.