If you have experience in building things, and have hand tools, you might want to think of remodels and fixture work. The merchandising end usually asks for experience. Some that might give you a shot without experience may be
Set and Service Resources
Action Link
Convergence
Channel Partners/BDS marketing does lots of 3rd remodeling-(that just means moving the shelves, fixtures, display areas, not tearing out the bathrooms or walls.)
Just do a internet search and you will find them all pretty quick.
Once you have some experience you really should list with NARMS. It like a clearing house for merchandisers and merchandising companies, It is really set up for the companies, but they also have a job board for the merchandisers to search. The companies see who has the skills they need and call and hire you and never list. Some jobs are a waste, some are great, it is a crap shoot.
Good Luck