For macro issues, read this sticky first:
https://us.forums.blizzard.com/en/wow/t/macros-essential-information/21139
Generally speaking, for trinkets you are unfamiliar with and having issues in a macro, confirm that they are on or off GCD manually before trying to macro them. Use the trinket manually by clicking on the character pane, and check if the GCD is triggered on your regular abilities. Most trinkets should be off-GCD, with few exceptions.
You also typically want to use trinkets, class cooldowns, etc before the active ability - mostly because you want the trinket to buff the ability rather than triggering immediately after and burning a GCD of the trinket’s buff duration before it affects anything.