Travel from Johor to Kallang Singapore

Hello all, I need some help with arranging transportation in Singapore.  I'm traveling there for Chinese New Year. I will fly into Senai Airport and take a bus to JBsentral.  What is the best way to travel from JBsentral to Kallang neighborhood in Singapore? Should I book transportation in advance or do you think the day of is fine?  Thank you for your help!

There are plenty of buses from JB Sentral to Singapore, most of them stopping at Kranji MRT station, from where you can use the excellent Singapore public transport system to reach your destination.
There is no need, in fact no possibility either, to book in advance.
There are also direct buses from Senai to Singapore, which would save you time.

Thank you Beppi! Happy New Year