Alright, so I've had tons and tons of problems already. Mostly about the minecraft launcher not working. I did lots of researching and finally found that I needed to use the Jar launcher instead of the native launcher.
After that, when I tried to start the game, java gave some errors which I fixed by going to "Edit Profile" and unchecking the JVM Arguments box (I have no idea why it works, I just tried it out).
When I click the play button, minecraft starts and starts constructing mods. After some time of waiting the game just closes and returns to "Game Output" tab on the launcher.