I thought I put this photo in my video today of where I get my injections but it looks like I forgot.  I am so sorry.  Here is a diagram showing where I typically get 2 units in each site: 

I typically get 10 to 12 units but occasionally get extra in my 11's like below. 

I hope this helps.  The best advice I can give is to start slow.  You can always go back anytime for more.