Modo was not the first software where I learnt modeling . It was a free open source software called Blender where I've learnt the basics. And most of the things I've learnt from youtube. You don't need to join any paid course. You can achieve the same , but if you are completely new to this it will take time to get a fair understanding of how things work here in Modo or any other modeling software. I would suggest you to have patience and try to understand the use of various tools available inside the software. Start from basic tools like move, scale, rotate, extrude, bevel. Modo is the least complex among all the modeling software available in the market.
Here is some software I tried so far before settling in Modo -
Blender ( free )
3ds Max (Industry standard, heaviest among all , and lot of tutorials available in YouTube)
Lightwave
Sketchup
Modo is a product of The Foundry corp. They have a whole ecosystem of VFX based softwares, from modeling to final compositing. Thus it's not a free software like Blender. Hope you understand what I meant .