They have to write. Not being flippant or snarky here, but no one gets to be a great guitar player by thinking about it, they get that way from practice, same with screenwriting, start writing and by writing it will also help you appreciate the approach of other scriptwriters. good luck
Vegas Pro has superior audio tools and is well known for being the most intuitive, basically they all do the same thing. Resolve will not run on my computer which is a pretty fast computer, I used to use Premiere, but for many reasons hate it and I am not alone, seems to be a program people love or hate? Great audio tools and intuitive use why fight the program you are using to do simple stuff? lots of free tutorials and when the program is easy to use, then you will dig deeper into its functions.
I don't think there are too many filmmakers or film, just like I don't feel there are too many bands, singers and songwriters or artists or sculptures etc. I am not saying the OP is the case, but often people feel entitled because of they desire to make a living from art and resent others that are making money and feel their failure is due to supply and demand and less worthy competition. I do not make any money from my films by design, I love making films and devote no time to promoting them, but instead devote myself to making my next film. In no way do I imply you should feel this way. What ever art it is it is a business. So, it is not filmmaking, it is filmmaking business or music, it is the music business. So many people are great at art and lousy at business, but in terms of money those that are good at business and mediocre at art make money and those great at art do not due to lack of marketing skills. There is no entitlement, no one owes anyone anything. Want to make money with filmmaking? Be good with marketing and business or find someone to partner with that is, case in point Troma Films.
A real problem with resolve is that it has to have a smokin fast computer to run. By far Vegas is the easiest, by being easy, means that you will dig into the program deeper faster, very intuitive and all other NLE have been influenced by its innovative (at the time) design.
Another thing is that most of us have huge piles of equipment we are never going to use, when you have little money, you make very careful purchases, when you have a pile of money, you end up with piles of equipment that you don't use.
Hitfilm is also free, I cannot recommend Premiere at all for many reason from MY EXPERIENCE not opinion. Here is an article about someone elses experience http://www.eoshd.com/2017/04/time-to-dump-adobe-first-impressions-of-res... I use Vegas Pro, but even if I used one of their cheaper programs like movie studio platinum which is pretty cheap to buy and a very capable program. Basically all programs do the same thing, but Vegas has some significant advantage in ease of use and superior audio tools and like they say 90% of a great movie is great audio. With the other programs you need a separate audio programs to do what I do, but for others audio may not be a big thing.