To achieve the priorities you want, you can do the following
SW1#spanning-tree vlan 200 priority 24576
SW1#spanning-tree vlan 100 priority 36864
SW1#spanning-tree vlan 300 priority 36864
What this will do, is make SW1 the root bridge for vlan 200 providing the current root bridge is above this value or using the default value on 32768.
Since you are setting vlan 100 and 300, above the default value of 32786, SW1 will become least likely the root bridge for those two vlan's.
SW1#spanning-tree vlan 201 root primary
Will make SW1, the root bridge for vlan 201. This command basically sets the lowest priority it needs, to become the root bridge. Remember, the lower the priority, the more likely the switch becomes the root bridge.
SW1#spanning-tree vlan 201 root secondary
will change the switch's priority, just low enough, without becoming the root bridge, in turn making it the root bridge, should the primary root bridge fail.
Please also keep in mind that all the effects described are dependent on using the default values.
Hope this helps you on your quest.