Hi @Moonshadow987
Your post was merged so we can continue the conversation here.
To record the game, I recommend you to use an external program like OBS, Camtasia, Fraps,... There are a lot of possible programs available. You will find a tutorial on how to use them in each program's website.
About how to peace together a video, you need to open the videos you have recorded with Movie maker, then cut them and join them with the program. It's easy, you will see once you have it opened.
And finally, about where to find mods. ModTheSims is the biggest mods website. Use google to find it, and then go to their "Downloads" section. They provide tutorials if you don't know how to install mods 😉
Good luck!