Slugs

Slugs

So, I rent a little house and the front yard is all black plastic garden fabric with about 4 inches of mulch over it. I pulled back the fabric to make a narrow flower bed right against the house and discovered a whole mess of these little gross slugs (they're just solid gray and do not appear to have much in the way of faces or antennae or anything). Other than tossing the ones I find in the bushes, do I need to worry about them much if I'm putting in a seeded wildflower mix? Will they eat the seedlings? I've never lived anywhere with slug issues before.
my room

my room

Purple Coneflower?

Purple Coneflower?

ID Help?

ID Help?

Autumn Toadstools

Autumn Toadstools

My small space

My small space

An Azalea

An Azalea