This will be my first time using HCG and I have a few questions.

I have 10,000 IU of Loeffler HCG I'm a rookie when it comes to this stuff
How long is the HCG good for after you mix the bacterial water with the powder?
What gage needle do most of you use?
What is the conversion from IU to CC?

I will be running 500 IU a day for 20 days.

Any Help would be appreciated