I've consulted for small businesses for years. One of the things you will run into is the real lack of IT knowledge these owners have. You have to earn thier trust FAST.
I do this by offering an inspection of thier existing technology, preparing a 10-12 page detail of what they have and how it's all connected.
I then recommend changes and upgrades to anything that places the owner at risk of loss or intrusion. NEVER suggest upgrading something you don't have to. If it works, don't fix it !
Don't ever bad talk the old IT guy ! He may know less and he may be the owners son !
hmm, what else. Hand deliver your invoices the day you complete the work.
DO NOT INVOICE until everything is working to the users satisfaction.
I also make sure to keep images of thier workstations for fast recovery. Try not to take the computers off site for repair.
Hope this helps ! actually, I hope this is close to you question ! Good Luck!
Shawn Lanthier
www.lanthierconsulting.com