Your 1st one hour will be test.
So, bid for just one hour with less amount. If I am satisfied with your work, then we will continue for more hours and it is a long term job for the right candidate. Putting more than one hour in your bid initially will make your bid rejected as I will hire some programmers for test of one hour and then will make my selection for on-going position from the selected candidates.
When applying, mention your VB 6.0 skills which you know the best, otherwise, your bid will be rejected.
Mention, the word "ready for test" in your bid, otherwise, I will consider your bid as spam and will reject it. Because, mentioning that word will indicate that you have read the full job description.