Go through a series of questions to find a modlist that works for you through our Wabbakinator quiz, or navigate the gallery yourself and pick something that looks fun. Some modlists have steps that you need to take before you install the list, some don't. Check your list's documentation on how to get started. Pick a destination with enough free space and click the "Start download" button. You might have to log into Nexus first, but rest assured it will just work™. If your install completed successfully and you're done with the documentation as well, you're now ready to launch the modlist and play!