Slimy compost means too much green and not enough brown
The ratio
Roughly two parts brown to one part green by volume. Brown is cardboard, dry leaves, and straw; green is kitchen waste and fresh grass.
If it is slimy
Too much green. Add torn cardboard and turn it. It will smell better within a week and be composting properly within three.
If nothing happens
Too dry or too small. A heap under about a cubic metre struggles to hold heat, and dry material simply does not decompose.
