a) titles like "plz plz help" aren't helpful. Make your titles descriptive. Give lots of details.
b) make a fall through queue for 0.0.0.0/0 and limit it to 1k, and move it to the bottom of the queue list. If a customer matches a specific queue for an IP higher up he gets that rate limit, if no queue matches traffic calls through and gets a 1k rate limit. That is assuming you're using simple queues, which is a guess given how vague your problem description is.
Specific answers require specific questions. When in doubt, post the output of "/ip address print detail", "/ip route print detail", "/interface print detail", "/ip firewall export", and an accurate network diagram.