All the questions you have asked have been answered over and over on the forums...

Anyhow you wont be seeing much with 2 iu's per day ... and i highly recommend you start doing them first thing in the morning .... so you dont stop your natural production ..

jump up to 4 iu's and see how you can handle that ... you can do the whole 4 iu's in 1 shot or you can split them up if you prefer ... 2 iu's in the am and 2 iu's post your workout ... keep carbs at least 1 hour away from your shots ...

if your getting joint pain ... try joint relief supps and see how that works for you ...

no one will be able to give you a 100% answer its different from one person to a other ... you have to experement on your self within whats common ... dont over do it ..

Id say get a better diet and more cardio in ... drop that BF and remain on your GH till you do ... then you can introduce some AAS

Good luck ! do more research~!