How do I do GAMEINFO just at all

You just create a new lump, name it GAMEINFO, then put your parameters in it. example:

IWAD = "my_terrific_iwad.wad"
STARTUPTITLE = "My Awesome Game"
STARTUPCOLORS = "00 00 00", "FF 00 00"
.
.
.

Just be aware that there are two gameinfos.

One is the GAMEINFO text lump and amother is the GAMEINFO block in MAPINFO.

Okay well thats Easy