Fastest money earning way?

I started RDO yesterday and as I was checking out the horses I found a few to my liking, especially the Gypsy horse and the mustang. I noticed they are quite expensive and as a new player, I am still figuring out the quickest way I could afford one of these horses. I tried doing stranger missions but earning 7$ per coach delivery isn’t exactly what I was expecting. So, my question is:

Is there a faster way to acquire the money I need to buy my saddle and horse?