(sorry, just answering a previous question about music)
For those of us who are not as gifted as Edd, music in our games can be a big problem. It's very time consuming for me because as I don't produce it, I'm constantly searching the piece of music or sound that fits the scene I'm working on. And sometimes I already have it but I've forgotten I had it. The begining of madness, that's what it looks like sometimes...
Now if I analize I would say that :
60% of the music and sound I use come from https://freesound.org/ This site is interesting for the sounds not really the music, as its name suggests. But you can find there some very interesting loops. I think, for us game makers, loops are more useful than a long and complete track. Of course I more than once modify what I find there but just some basic modifications to fit my needs. The site is not sexy but worth a try.
20% are real tracks (sorry if it's not the right term) like the ones you can find on incompetech of the famous Kevin MacLeod. Just saw an interview of this guy 2 days ago. He's very interesting and funny and he is the one who saved most of the content creators of the planet (nothing less) who don't happen to be musicians too.
10% from friends or people I know.
For the rest i sincerely don't know. Each time I find something cool and free I download it even if I don't have a need for it. Sometimes I even buy things but it's very rare and I'm allways deceived by these purchase. All in all that's how over the years and diverse projects I have now a huge collection (but it's never big enough and never will).
Majid, I hope you'll make us a thrilling RPG with good moments of tension. We're all clients for that but you cannot achieve that without the good sound or music so good luck. For the rest, the kickstarer, Patreon etc... good luck too.