Some places you can find a critique partner are local writer's groups (only if there are others who write in your genre or subgenre), RWA chapters, or other writers' groups
If you write romance and don't have a local chapter, RWA Outreach and some specialty chapters offer excellent critique programs via email.
Some writing sites offer critique groups as does some writing ezines and listservs. Ask around.
WHAT TO LOOK FOR AND WHAT TO AVOID IN A GROUP
Read the chapter starting on page 45 on critique groups in Holly Lisle's MUGGING THE MUSE. http://wordgoddess.50megs.com/ The whole book is free and well worth the download.
MONDAY'S TOPIC: The Ethics of Critiquing