Hi there Majone,
I dont think you would do any harm using gentle massage on your recipient site after about a week, baby shampoo is generally recommended among the over the counter options, also I was advised to keep the recipient site moist- saline solution (salty water) is good for this. You could just dab with a soapy sponge if you were worried, but the grafts should be secure by now.
In terms of how many hairs, typically it would be between 1 and 4 actual hairs per follicular unit for Caucasians & Asians (you just say grafts in your post- I'm assuming & I really hope they were follicular units)- but I think for people with African genes you tend to have slightly more hairs per fu. That said a sensitive Dr should probably have put thinnish hair at the front of the hairline? Where did you go?
Anyhow best of luck