For a first cycle it is best to stick to testosterone solo. First of all, since it is your first cycle, your body will be hyperresponsive to testosterone, so you will get very good results as is. Secondly, in bodybuilding it is best to be gradual, and not start off with the heavy artillery - better prepare a good basis for the more serious compounds, so that you will be able to get the best of them.
Finally, trenbolone is not only extremely powerful, but it is also extremely harsh in terms of side effects. Therefore, only the experienced ones who already got to a plateau should use it, but definitely not a newbie who did not run a single steroid cycle before.