this stuff is to zip:
MAPS
contains the .bsp you get after compiling the .map you made with your radiant
contains the .tga of the minimap
might contain also a folder with some pics starting with "lm_ " or similar... in case you have used 'lightstyles'/flashing lights

LEVELSHOTS
contains the .tga/.jpg of your levelshot, the picture that shows up during loading

SCRIPTS
contains the .shader and the .arena files.
and the q3map2_<mapname>.shader for the flashing light, in case you have used any.

TEXTURES
contains the textures you used, in case you do not just use standard urt textures but own ones

arenafile is a .txt renamed to .arena, with a similar layout like:
{
map "ut4_ramelle"
longname "Ramelle"
type "ut_ffa ut_team ut_survivor ut_ftl ut_cah ut_ctf ut_bomb"
}