Should I configure an explicit deny rule at the end of the list which there is applied to the Resource Policy?
>>>If you would like to, you can; however, there is an implicit deny for anything not in the allowed ACL
Where can I find in the logging about permitted or denied packets with source and destination ip addresses , ports ...?
>>>Do you mean to ask if you can see what users are connecting to over the VPN? If yes, this is not an item that is recorded in the logs.
Should I configure several General Rules or one Detailed Rule with multiple grouped rule entries to bind these on a resource policy?
>>>Up to your policy/management style for configuration