Groovy is based on Java, a good starting point is http://groovy.codehaus.org/. You can directly use the documented Java API of JIRA (see Atlassian API Reference). I think a good way to start ist to look at the examples in the Script Runner documentation and the scripts provided by Script Runner and maybe the Atlassian developer docs.
Henning
For changing the status you have to transition the issue through the workflow. You could use the built-in fast transition postfunction of Script Runner or you can do it on your own like described here. https://developer.atlassian.com/display/JIRADEV/Performing+Issue+Operations
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You can use the script runner panel and try to fetch values from JIRA using the JIRA Api's .
You can try this as your first script . You can start with fetching current user , customfield value for a specific issue , number of issues , Project lead , etc
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