Most people probably don't think of Craigslist first when it comes to selling online, but let me tell ya... it is fantastic! I have made tons of money and moved some large items through Craigslist as well as finding and buying many items.
First of all - create a user account so that you can sign in and see all your listings on one page. No one else sees your name or account information so just use something you can remember.
Next list your item using the same principles you would anywhere else good keywords in your title as well as making it sound enticing, so let's sell a child's dresser for instance.
Used Dresser for Kids OR Adorable Functional White Painted Dresser Great for Kids
Then describe it in your listing but something to know with Craigslist, don't make it too wordy, I have found less is better! So give size, color and basic info but don't go into great detail, since the person is probably coming to your home or meeting you somewhere to pick it up they will see before paying... a little sales trick get them there and committed!
Craigslist allows you 4 pictures - make them good ones! A picture speaks a thousand words. And if it is something you don't have a picture for - then put a picture of a for sale sign or something that triggers the listing to get the pic symbol next to it because most people will not click into an item without pictures.
Now I know the rules say one listing in one category every 3 days... here are some workarounds... shhhhh don't tell them I told you this!
Take that same kids dresser - list it in the furniture category AND here's how to get it in a second category... change up the title and description a bit for instance:
White Children's Dresser Chest ADORABLE! Functional! and then move things around in the listing.
Now if it's something that is going to get lost in say the furniture category which posts hundreds of items a day (in my city anyways), figure out ways to change up the listing so you can trick the bots into letting you list it every day!
I find if something is going to sell I will at least get some questions in the first 24 hours - otherwise I may need to look at my price... that seems to be the key on Craigslist! Shoppers are looking to find that item they want or need quickly!
Some tips when the emails come in... you will get spam! If there are no indicators someone is a real person it's probably spam, better to use a return email address like yahoo or gmail that can weed these out if you do respond. A serious buyer is more likely to ask some specifics about the item, not just ask still available? Also need I even mention if someone wants to pay by cashier's check and it's a million dollars over the amount but they trust you and all... run! Scammers delight on Craigslist.
All that being said, Craigslist gives you a way to negotiate with a real person via phone or email. You can sell just about anything there! Of course things like firearms and pets are no no's. There are no fees so nothing ventured nothing gained!