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You can use RVIZ to provide your amcl localization with an initial position estimation. Then after driving around a little with your robot, the localization should work fine... expecially in simulation...
I don't think it is a good idea to "play around" with the resolution/position parameters if you are not really sure about what they mean. You should first check if you set up all sensor-streams and tf-settings correctly and visualize your map and localization in RVIZ...
What sensor are you using for localization?