For your Interface I would recommend using Weakauras and Bigwigs.
Weakauras will give you the opportunity to import a lot of helpful stuff to keep track of your cooldowns, buffs and debuffs.
BigWigs for having a boss mod helping you out to plan our cooldowns ahead of time and be prepared for certain abilities that are about to happen.
Here are some useful Hunter macros everyone should have:
Trueshot, Trinket & Berserking Macro
If you have a trinket which cooldown lines up perfectly with trueshot, you use both at the same time. This just gives an extra action bar slot for anything you want. In case the trinket is out of cd and trueshot is not, you just press the macro to use the trinket.
/use 13 or 14 ( Trinket slots)
Resonation Arrow Macro
This is for any spell that has a target reticle such as traps, flare and binding shot.
/cast [@cursor] Resonating Arrow
Aspect of the Turtle Cancel Aura
You're unable to cast spells while being in Aspect of the Turtle so it might be useful to cancel it sometimes.
/cancelaura Aspect of the Turtle
Misdirection Mouseover or Focus Macro
IT'S IMPORTANT FOR MM HUNTERS TO USE THIS MACRO FOR EVERY OFFENSIVE SPELL
The auto-cast system in the game is super slow on pets and you might miss out make sure to use this macro.
Another important topic is the pet attacks, you should macro them into all of your abilities when you're using a pet to guarantee the pet will use them on cooldown and not miss out on damage.
Here is one example for Multi-Shot. It is recommended to macro these into every important ability while using a pet.
/use Smack(Basic Attack)
/use Bite(Basic Attack)
/use Claw(Basic Attack)
Some auras that I find really useful are the buff trackers, such as for Trueshot, Precise Shots and Posthaste. If you are hiding your action bars as I do, Aimed Shot stacks and any cooldown tracker is also really good.
Afenar does some really good WA so you can check him out at https://wago.io/p/Afenar or you can find a wide selection of Hunter auras at https://wago.io/shadowlands-weakauras/classes/hunter.