It's going to all depend on your goals brother. inwoukd say generally tren is left off until a 3rd or fourth, but you could add mast, npp, deca, eq something like that ... I add one compLund as for the same reasoning you run test by itself the first time, you can see what sides you have and you will know the added compound is causing anything different than your test only run.
Again in it will depend on goals, and everyone will be different, some willing to go mote conservative and some willing to push the envelope ... In the end just make sure you've done your research to run whatever you choose as saga key as possible
Usually for a second cycle , its nice to add a oral , like dbol ,50 mg ed for 4-6 weeks , also whats your goal , for bulk dbol , if looking to cut or tighten up , maybe anavar , I would stay away from the 19nors , on a second cycle , maybe the 3rd , a nice npp and sust , actually its not a bad 2nd cycle , the options are unlimited ,
X3 with benoit23 and sieg