Crime Reports/Statistics

How do I find out if a sex offender lives in my neighborhood?
How much does a crime report for a neighborhood cost?
How often is the sex offenders registration updated?
I am thinking of buying a new home. How can I find out how many times the Police were called to homes on the street?
I requested an offense report and only received the first page. I want the entire report, how can it get it?
Where can I find information about crime statistics in Round Rock?
Where can I obtain a letter stating I do not have a criminal record within the City of Round Rock?
Who do I contact if I have questions about the sex offenders registration?