Can I ask?

[77cash]

Can I ask how do you make a map? Is there a special program taht I need?

 

[crackhead]

make a map with hammer. it comes free with hl2. you need to download the source sdk and then you will have it under steam>tools>sourcesdk>hammer

 

[$kelet0r]

seeing as you will be back then asking what to do check these sites for advice
http://www.interlopers.net/index.php?page=hl2.htm
http://developer.valvesoftware.com/wiki/Category:Level_Design#The_Essentials

 

[77cash]

Do I use that same program to make skins and characters and shit like that?

 

[$kelet0r]

no u use photoshop for textures
u use 3dsmax or xsi for modelling

both are prohibitively expensive but can be dl off the internet dubiously
don't expect me to help you do that

i think your jumping the gun a bit
it'll take a long time before you can do anything in just one of these so ignore skins and modelling until you can use hammer well