>I'm looking for a form to control who did what at what place and when he did.
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>This kind of form is needed because hours have already been paid by the customer. We need a way to make the client sign that form so that we can have a perfect control over the services that were delivered. That way everybody will know how much time is left in the bank of hours accumulated.
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>Besides that need would there be a place on the net where I could get sample forms for everyday business tasks?

You are not looking for a form, you are looking for a Project Management application.
I suppose that you will need Gant Charts etc.
We made our oun, but I think that you can use MS Project Manager.