>1. Error checking - can anyone give me some pointers on good error checking >procedure in a VB app?

hope this link will help

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvbpj01/html/gs0101.asp

>2. Can I part prepare forms and/or controls and then re-them as templates?

well i make template forms and then use save as..

>3. Is there anyway quick way of commenting/un-commenting large sections of >code in VB?

in your VB IDE go in View --> Toolbars --> Edit
you will find comment/uncomment block button in that

>4. Any other tips for someone who is trying to build a robust VB app? Maybe >a top ten do's and don'ts?

i think that u can find on msdn