Okay to start off, try to be different. Before you make your map, 
search around and make sure that either no one has done your idea or 
it hasn't been done often. Okay and here are the two parts that almost
instantly tell you someone is a noob modder. Those annoying Yaving 
textures and sky. Those are the map killers. (unless you're doing 
Yavin) For Pete's sake, CHANGE THEM! Make them Hoth, Mustafar, or even 
Endor, but PLEASE, do not use those textures they have been seen far 
too many times in a map. Okay after you've changed the terrain and sky,
let's add some objects. Go to your assets folder in the main directory
of your BF2 Modtools folder and click on worlds. Click on a world that 
has something to do with your map and copy the ODF and MSH files. Then
go to your mod maps directory (data_XXX) and paste the in YOUR world 
directory. (Data_XXX\Worlds\XXX or Data_XXX\Worlds\XXX\world1) Okay, 
now that you have some objects to work with, open up ZeroEditor in your
 mod maps directory and load your map's .wld file. Load the layers that
 you want to show up, click "build accurate collision geometry," and 
click the load button. Now go to objects. Click on the browse button 
and go to your mod maps world directory and open up the file named ODF. 
Pick an object. (If it doesn't load the object and you can't see it, if
 you click it will probably crash ZeroEditor.) Now that you've got some
 objects out you change the textures or add cps or munge your map and 
play on it. But before you do that I recommend you change the height a 
little. (its another way to spot noob modders.) Make sure that you 
don't make it too steep or you won't be able to get to it. (this can 
also cause terrain glitches so be careful.) Make sure that your map 
isn't TOO big or its going to be boring unless you have, like, one 
thousand units which causes lag. You can also add more cps which is 
documented in your BF2 Modtools folder. You could also create your own 
heroes and such. (also documented) If your map is small make sure that 
you either A. Don't make any vehicles or B. Don't make very many 
vehicles. If you make too many at-sts and such, your map is going to 
become a death trap. Another important thing, make sure that your AI 
have planning so they don't wander around mindlessly trying to kill 
people (they have to be a bit smarter to do that.) But the AI 
automatically travel to a cp so it still works - kinda. If your 
building a multi-leveled world your going to run into some issues with 
AI planning. When you're done editing you can save your map and munge 
it. Just go to your mod maps main directory, click the folder called 
_Build, and doubleclick on the .exe called visualmunge. A screen will 
pop up with several options on things to munge. Click the button 
'Select All' then click munge. This will take a while (5-10 minutes 
tops unless your computer is either really bad or its a HUGE file\map) 
while your waiting you can maybe, start your homework the day before 
its due, or maybe catch a basketball with your face (I've tried it, 
doesn't work too well) When its almost done a log file will pop up and 
tell you if anything went wrong. (If it doesn't pop up then nothing 
went wrong) Shortly after that a screen will pop up something like this. 

There's magic in the air... 
     Go run BF2
     |---------|
     |   OK    |
     -----------

Click OK and your map will be complete. Go run Battlefront 2 and you 
will see your map in the instant action list. Start it up. If it 
crashes, here's an easy way to figure out what caused it. Go to your 
BF2 Modtools directory and look for the .exe labeled Modtools. Copy it 
and put it in your Gamedata folder. Click on the one in the Gamedata 
folder and it will run what looks like the PSP version of the game. 
There will be a green bar at the top. Now run your map and watch it 
crash. In the Gamedata directory a file will be created called BFront2.
 It will contain any errors inside of it. Wait for about a minute for 
it to get all the crud written down and skim through it. If you 
absolutely CANNOT find what went wrong post it here on Gametoast and 
someone will help you with it. (eventually) Now just wait for a day or 
two and look at the responses. If someone posted and told you why it 
crashed then go and fix the issue. (Most maps I have made have not 
crashed.) Once your dilemma seems to be over and you have addressed 
the issue(s), run visualmung again and select the place where something
 went wrong and munge it. When its finished munging run your game 
again. If your level works, look for bugs (floating objects, 
non-localized weapons, etc.) and glitches (walk through walls, fly for 
all eternity, go through the ground.) Once your level is complete you 
can make a readme explaining the map, it's contents, etc. Then you can 
put it in a .zip or .rar file and post it on Filefront or ModDB. Then 
watch the download count rise ever higher, all thanks to this great 
tutorial/guide. P.S Remember to thank me in your readme or I will be 
very upset. I mean seriously, I spend an HOUR of MY time to help YOU 
make a good map. So you better remember the name Vegati, lest a 
thousand Geonosians assault your living quarters.