Several things are needed in order to engage in this adventure. For the most part they are free or something you already have. As you progress you may need to spend a little bit of money but I assure you it will pale in comparison to the money you can make from craig... in other words... profit!
ADVISORY:
Do not purchase any posting software... especially any automated posting software. That will get you in trouble with craig. They are very successful at eliminating the workability of this type of software and even shutting down or worse grabbing (legally) the sites of these vendors!
Everything I do is manual and yes it can be time consuming but if you stay organized you can be very efficient and effective.
LIST OF MATERIALS:
1. Dedicated email account (I use gmail) https://accounts.google.com/
2. Phone Number (for phone verification of account)
3. Spread Sheet (to stay organized)
4. Image Editing Software (I use photoshop and/or Xheader) http://www.xheader.com/
5. Image Hosting Account (I use free photobucket) http://photobucket.com/
6. CC Cleaner http://www.filehippo.com/download_ccleaner
7. Coffee (or another preferred stimulant)