I just started "quest modding" and the dialogue will show up and then vanish as the next one queued is shown, how can I show this down so that people can actually read what is said?

Have you got a mod active which 'dumps' your cache, or whatever the term is? I'm using Ring of Streamlining and the readme says that what you are describing can happen. Tho, touch wood, it hasn't happened to me, yet.

The game dialogue is designed to be used with voice files which must be played in order to prolong the duration of on-screen text. To get around this you will need blank mp3 or wavs that match the file names and folders given to you by each dialogue piece. Usually 5-7 seconds is enough for a full text block.

Use tes4gecko. It has an option 'generate responses' which creates the blank voice files you need.