I’ve finally finished making my font, and I cannot figure out how to install it! I’ve exported it (using the settings in the picture), but I cannot figure out how to add it to Font Book. That’s all I need to do, and I would really appreciate it if someone could help me out! I’m not too good with fonts, as this is my first time making one, so sorry if I don’t understand too much 
Just double click the TTF and click Install Font.
Ok, thanks, that worked. I wasn’t expecting my font to look 100% perfect on the first try, so now I’m ready to tweak it. My question now, is, how do I adjust the spacing and fix the issue with the ‘M’ and the ‘W’ being smaller than the rest of the letters? Thanks!
You can use the transformations palette to manipulate your contours.
I assume that you designed your glyphs elsewhere and copied them into glyphs. It can sometimes lead to these kind of problems.
You can also use the bounding box option that you can find in View > Show Bounding Box:
You have to be aware of potential font cache problems. Read this please:
http://www.glyphsapp.com/tutorials/eliminating-font-cache-problems
That is why I recommend using the Adobe Fonts folder:
http://www.glyphsapp.com/tutorials/testing-your-fonts-in-adobe-apps
Well, I figured out how to get the M and W to the appropriate size, but I’m not understanding what you mean by using the Bounding Box (I really don’t understand it) to adjust the spacing? Also, I didn’t make the glyphs elsewhere, I did it directly in the app.
Try View > Show Bounding Box, or search for the term in the PDF of the Handbook.