Great question! Here are the key things to look for in a security audit:
1. **Code Coverage**: Ensure the audit covers all critical functions
2. **Common Vulnerabilities**: Check for reentrancy, overflow, access control issues
3. **Gas Optimization**: While not security, it's important
4. **Documentation Review**: Make sure the audit includes documentation review
I'd recommend starting with OpenZeppelin's security guidelines and then getting audits from multiple firms.