Are you planning on doing the lion-share of teaching? There are different approaches to home-schooling. Some people form a community/network and split up teaching tasks.
There are a few parent networks in Kuala Lumpur. As Kuala Lumpur also has an established expat community, you should be able to find other groups of expats looking for social engagement. As it's a big city, you shouldn't struggle for things to do.
It might be useful to read this Expat Arrivals page on kids and family in Kuala Lumpur.
There are also one or two homeschooling centres which operate in Kuala Lumpur. You should be able to find them on the ol' Google.
As so many materials are easily accessible online, homeschooling can be a great schooling option.