Where and how can I publish my game?

I'm currently finishing my game and I'm interested in some details:

1. First of all, this is the actual gameplay : https://www.youtube.com/watch?v=RIy2tZcjUXo and I want to know, if it looks fine enough to be published(Sorry for terrible video quality). If not, don't bother reading below.

2. You'd notice some things in demo, which possibly should be censored. Can I leave them?

3. Also, I'm wondering about my assets: most of the textures are searched with google and I have no idea, where they come from. The same is with the sounds. I just want to be sure, I can use them.

4. With this, I also want to add some background music, but I can't make it myself. So, can I just use anything found in my computer?

5. Next, nothing like "Donsky Productions" officially exists, so can I leave it in intro and jut add note : "non-existing company", or should I get rid of it?

6. Also, I want to recheck something: the game is made with unity FREE and I want to be sure, I can sell it. If yes, then does Unity get any part of my profit(I just wonder, if it does so, I have nothing against it)?

7. As long as I'm just a guy sitting at home and making this without having any company or at least an official part, I understand, that not all stores will accept my game. So, I just need any suggestions which stores can I try.(I thought about Steam Greenlight, but as I have to pay 100$ just for uploading and I am not sure, the game won't be rejected, I just have some fear of risk.)

8. the last thing I want to know is, what will be the fair price for this game and what can be the possible profit?

PS: Sorry for wasting your time, but I anyway expect some help.