I would advice to do at your local Immigration Office as the re-entry permit is valid as long as your current permitted to stay, no rush and no need to be nervous.
You mentioned: " ( if I have all necessary stuff ready , money in my bank acc , papers etc ? ) ". You can apply but you must meet all the requirements and the minimum of 2 months money in the bank.
What you show has nothing to do with a 30 day Extension of Stay, which is a big stamp in your passport with dates and signatures.
This is a receipt of notification of your address.
Search your passport for the Extension of Stay permitted up to xx/xx/xx or go back to Immigration and apply again. Do not leave before you understand all.