Questions in Game Dev

So this is a question for you guys to answer if you are making a game or just starting to make a game I can help by making a short or long story for your game just don't expect it to be a really detailed one but I can help anybody in need of a story.
Can anybody help me with finding a good engine for a horror game like outlast and some tips on how to make a game?
Hi
Just wanted to ask
should i make a game similar to Modern warfare's Gunfight mode only ?
I already have the project ready from My previous game, just need to make the game mode and setup everything like timers and spawning weapons e.t.c
I wanted some tips to make a good song for random rpg battles. I also need tips for a song for a laboratory.
What is the best free alternative to Photoshop

Hey guys I post the First Demo of my In-progress game is in
spanish because I am Spanish but i can make an English Version if you want