You need to know what concentration your test-E is before you can know how much to take. Typically (but not always) it comes as 250mg/ml. That means that every ml (or cc, same thing) that you inject will contain 250mg of testosterone enanthate.
With test enanthate, you want a cycle to be in the 8-12 week range. If your gear is 250mg/ml, you'll need 2 bottles for a decent cycle.
And if I were you, I'd spend the next month researching everything you can about testosterone, AAS, and PCT before you start any cycle. Wouldn't it seem absurd to you to inject something into your body without really knowing how much to use, what you should expect to see, what negative side effects might occur, and what happens after you stop?