Are you asking how to give your custom level a name in-game, like "Greenflower Zone Act 1"? If so, you need to make a level header, which is explained on this page: https://wiki.srb2.org/wiki/Level_header
"Linedef types" come in several varieties, so it's not easy to answer your second question off the bat... though I'll try anyway. Most linedef types do something special as soon as you start playing the map, like spawning FOFs or slopes or polyobjects. The rest, which is really just most of the "trigger linedef" and "linedef executor" specials, need to be activated by something first, typically a trigger sector or another trigger linedef or something like that?
If you haven't found the Zone Builder tutorial yet (assuming you're using Zone Builder, anyway), I highly recommend you check it out in case it helps you: https://wiki.srb2.org/wiki/Zone_Builder_tutorial
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