Alright...here comes the airplane.
The gel is rubbed on your skin and the injectable test is oil based and injected into the muscle.
It really depends what you are going for. Some guys have to run test forever because there bodies no longer make enough naturally. If you are talking about doing a small blast, you could run 300-500mg per week for another 10-14 weeks. Then do a proper pct.
Ai doses are different for everyone. You should have gotten blood work done before you started so you would know your baseline levels for testosterone, estrogen, etc. You can research around the site and figure out which exact tests guys are having done, depending upon what you are running.
To figure out your ai dosages, you would run more blood work midway through your cycle and see if estrogen is high etc and use some adex or aromason to lower it, if it is high. Many guys don't even need an ai at the dosages I quoted above but we're all different. That is the reason to get blood work before you start.
And you should also get blood work done after you have completed your pct to make sure you have recovered to about the same levels as before you started your cycle.