So I am finally finished with adding the notes to a CDLC I want, however, I now want to add lyrics to it, but I have no idea how. The internet didn't really help, so here I am. Also, how can I make and set custom difficulties, so there are many levels of difficulties, instead of the three or four the DD makes.

EOF can import many different lyric formats (see the manual for more details), but if you can't find an existing lyric file to use it's not too difficult to create one from scratch. Many people here have taken a liking to a lyric editor called Ultrastar Creator.

Most people use the UltraStar Creator to create the lyric files. 

 

As for the difficulties: In EOF go into "Track > Rocksmith > Insert new difficulty"

 

You can also automate the DD process by using the DDC.

 

 

EDIT: Ninja'd, curse you raynebc.

Thanks, I'll give UltraStar a try, hopefully it's not too difficult to understand to use.