tren can be run alone, some people love it, but as you can see it can also cause issues.
generally reccomend against such, though there are certainly those that do fine with it.
post cycle
clomid 50mg- no frontload
dopaminergic (should always be run after a progestin)- may want to run while on tren as well
HCG- though if you use HCG be sure to use an AI, preferably aromasin or AIFM, with it and at least 5 days following.
aromatase inhibitor may also be used as part of PCT