To answer the OP: In terms of clearing debts quickly, ebay or some type of cash converter/pawn shop may be your best option if you have sellable stuff. And if you look online, you'll be suprised just what is sellable. Many of the pawn shop's around me in the UK use ebay as a guide for buying anyway so you can check prices and then haggle.
I used to sell on ebay. Due to it's automated processess of alerts, reminders, invoices and packing labels it was the one thing I felt I could do with my "housebound cognition" and I mainly enjoyed it. Never made any decent money of course but for a while I felt like I had value in the world again.
The strain came from taking photos, writing descriptions, setting prices, packaging and posting. But there is a lot of help here too, especially with online door-to-door couriers. Eventually, I had to give up because I used to crash after each bout of packing (and watching my own auctions played hell on my nerves!) but it could be an option as op isn't looking to make a full-on living from it.
Perhaps a longer-term online selling option for OP and many others on here may be dropshipping?
For those that don't know, drop shipping is a retail method in which the seller doesn't keep products in stock. Instead, they partner with a wholesale supplier that stocks its own inventory. The retailer transfers customer orders and shipment details to the supplier, and they ship the goods directly to the customer. The biggest benefit of drop shipping is the seller doesn't have to worry about fulfillment or inventory issues. A huge relief for guys like us.
Also, most customers don't know the seller is drop shipping, since "private label shipping" lets a retailer ship from the wholesaler with a return address and invoice customized to the sellers ecommerce store. Many, many sellers on ebay dropship which is one reason why they are able to offer free postage. For those in the UK "The Trader" magazine ( I'm sure they have a free website) is a good place to look for suplliers.
There are a few problems of course. You have to find a decent supplier/s and build a relationship with them, there are set-up costs involved in starting any online store, even an ebay one, you will have to arrange a percentage payment with the supplier and there is the problem of dealing with customer complaints for an item you may never have even seen.
The few customer complaints I used to get on ebay as a private seller wiped me out and the thought of having to ring round to chase orders plus the other negs completely put me off dropshipping. But I am not any you guys. If I were, I'd be much, much more handsome
I hope that has helped someone, if not the OP. I think I have an ebay newbie's selling guide somewhere. It was sent to me by a friend and if IIRC it was pretty good. I'll post it if I can find it, or some links later.