I am a long way from being an expert on this, but I am fortunate to be able to hang around a number of folks that are, and it is becoming clearer and clearer, that if you are going to start from scratch, there is only one clear option for those of us in the US.
https://www.tinmantech.com/products/welding/
Kent White has spent the greatest part of his metal shaping lifetime researching and studying this lost art and has developed not only the most applicable equipment, but the most logical approach to learning gas welding that I have been exposed to. He was at my shop for eight days just last week and I witnessed first hand his knowledge and technique. I struggled with getting any form of decent results until I watched a video of his on gas welding aluminum. I do not want this to seem to be a 'sales pitch', but this recent time spent around him has reinforced my earlier appreciation for his approach to gas welding both steel and aluminum.