I have a good friend who is working freelance in the sound mixing industry. He records, mixes, produces and also does a little video sound now and then. I think he makes around 1k usd pr month from it on a bad month and 3k on a good month. So he works on the side.
But I think it depends on how bad you want this. If you really want it you can choose a simple ...
I make a great living doing sound engineering work.
Figuring out how to actively seek out clients and do the business side of things has
helped me tremendously.
The main thing I learned to make money in the sound biz is to go directly
after your targeted profile client. Who is she? Advertising firm, mobile game, rapper in atlanta? Who would be your ...
Field recording is the most crowded area of SFX libraries. For a passive income you may need to find more specific areas.
For contract works, without a portfolio, the only way is to go for your close circle and try to join projects of someone you know in person.