maybe this will help: http://multidoge.org/help/v0.1/help_importASingleKey.html
multidoge is a lite wallet, so you won't have to sync the full blockchain. you'll probably have a lot more interested buyers if you can import your pk, and send the DOGE to the buyers address, and let him pay after he received his/her coins (only trade with trusted members this way, or better, use an escrow... even tough the amount you're trading for is really low).