Welcome to the boards Jean! I hope you are able to find the information you are looking for on here. I can help you with the testing and timing, but I've never used an agency so I can't help you there.
Infectious disease ie: HIV, Rubella, Chicken Pox Vaccine etc...
Sperm Analysis (may want to ask for karyotyping as well)
HSG - hystosonogram
Some clinics like to do a mock cycle (highly recommend doing this, that way you avoid any lining issues that can arise during the real cycle)
You can anticipate anywhere from 3-6 months to get a cycle going. It really depends on if you are going with a clinic that you are already with or a new clinic. 6 months if it is a new clinic and you have to do all the testing and the mock.
I hope this helps you a bit. I'm sure one of the other ladies will chime in and give you some advice about using an agency or not. Best of Luck to you and your husband.
All my best!
Me - 32 yrs
DH - 33 yrs (perfect)
TTC #1 - 5 yrs
DX: Hashimoto Thyroiditis / high fsh / blocked tubes
Highest FSH 72
Highest E2 - 1400
DE #1 (vitrified eggs due to complications) - Nov 2009 BFN
FET #1 - Jan 2010 BFN
Tubeless May 2010
July 2010 - Donor Selected! Woot! Woot!
DE #2 - Oct 2010