For editing Quake, you will use a different tool for each task...if there is an all in one tool, I've never found it!
I use quite an old tool set myself and you would probably be better of finding tools that suit you. You will need a Level Editor, a Modeller, a Texture editor/compiler and a PAK Builder...for starters, and when you get more adventurous, you can move on and start programming QuakeC!
You can find a very reliable resource of tools and tutorials for Quake editing, here:- http://wiki.quakesrc.org/
Cheers,
Fox
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