If you don't know what kind of
test you have, I highly recommend you DON'T start sticking yourself. You might want to read some of the stickies at the top of this board, such as "newbie cycle faq" and whatnot.
I think you are talking about
test with an ester coupled to it so it releases on a "schedule" over time. If so, then what you're looking for for a short cycle isn't going to be much fun for a new guy.
Test cyp and enanthate are recommended for first timers usually because you only need to inject twice a week with those esters. On the down side, it takes a while to kick in so people usually use it for 10-12 weeks.
If you really want to run only a 6-8 week cycle, you'll be looking for
test prop which you need to inject every other day at the max. So you're looking at about 4 injections per week of a
test ester that has a historically "stinging" effect when injected.