get these DLs first
spark edit http://files.halomods.com/download.php?id=4439
Hmt http://files.halomods.com/download.php?id=8073
ppf o matic http://files.halomods.com/download.php?id=5
sparkify (BG) http://files.halomods.com/download.php?id=48183
these are the basic tools that i use for modding trial
lets make, say a cliff mod, and only trial user should know what that is

ok first open up ppf-o-matic, select blood gulch as the ISO file, and BG sparkify for the ppf destination
Patch complete ready to copy files to CD or whatever it should say
ok, that ppf lets you open bloodgulch with sparkedit so open it with spark edit
it will say that you have an error with bitmaps.map, just click ok
and go to the edit tab and select vehicles, select your hogs and drag them to whichever cliff u want them on, both red and blue base should have a different cliff though. now to add the invisible teleporters, just click add teleporter pair up in edit, drag the points to whever u want to teleport(the cliff with the hogs on it) and do the same for blue base.
then go to MP equipment in the edit tag, select a sniper rifle on any base, hit ctrl + C and drag that sniper into the cliffs(the ones with teleporter), keep copying untill u have about mm.... 4-5 snipers in each cliff
File/save changes
close sparkedit
now go to ppf omatic, set the ISO file to bloodgulch and the ppf destination to undo sparkify, apply
now for a little hmt, open hmt, and bloodgulch in hmt
go down to the wepons tab and go to rwarthog gun, go to magazines and give it infinate ammo
go to projectile/rocket launcher/ rocket and make it about 5x faster, save changes and thiers ur cliff mod : )
you can repeat this tut and make like 5 teleporters to different cliffs if u want
credits to, all those people that made those programs, god bless halo

im a newb modder who only has trial version : ( so plz dont flame
thx