Everything you need to know about county cricket is to be found at this link
https://en.wikipedia.org/wiki/County_Championship
Scroll down a long way to "points system" to answer your specific question:
Points system
The county championship works on a points system, the winner being the team with most points in the first division. The points are currently awarded as follows:
Win: 16 points + bonus points.
Tie: 8 points + bonus points.
Draw: 3 points + bonus points.
Loss: Bonus points.
Bonus points are collected for batting and bowling. These points can only be obtained from the first 110 overs of each team's first innings. The bonus points are retained regardless of the outcome of the match.
Batting
200-249 runs: 1 point
250-299 runs: 2 points
300-349 runs: 3 points
350-399 runs: 4 points
400+ runs: 5 points
Bowling
3-5 wickets taken: 1 point
6-8 wickets taken: 2 points
9-10 wickets taken: 3 points
