should you do cardio before or after weight training?

This is my first time trying to get lean due to my carbs being low I'm noticing a size difference in my muscles should consume more protein?

I am slowly working on creating a gym space in my home. There are many options to choose from on Amazon, but in your opinion, what are the best brands/companies to order equipment from? Such as squat rack, bench press, etc. Thanks so much!

Hey Marc. I'm a 44 year old male who just started weight training. I've followed bodybuilding for years and for the most part I'm very familiar with weight training. My question is I know muscle maturity peaks in our 30's and at 44 I've noticed its harder to keep or rather maintain muscle growth. Any tips on how us older men can use supplements to keep muscle gains at our ages.

Ps. I was at star fitness when you were training with Victor Martinez. You guys killed it

Thank you 

HECTOR