I'm a new mum. Just want to ask do i need to dry the milk bottles after sterilizing?

There is no need to wipe/dry the bottles after sterilizing, just keep it inside the sterilizer. In fact, if you take it out to wipe/dry, you are defeating the purpose of sterilizing because wiping it will introduce more bacteria (from the tissue/cloth/towel) and taking it out would allow the particles in the air to get in the bottle! Depending on the age of your child, you can choose to stop sterilizing at your own comfort level - generally it's more important to sterilize in the first 6-9 months, but after that, it's up to you because they get exposed to more bacteria (especially when they explore and bite things) when they start having solids and crawling around.