"Children education business" is still quite vague. Try to put more research into it & decide more precisely which one you're planning to go into;

1) tuition center, from standard 1 to form 5?
2) early child education
3) pre-school or kindergarten (below 7 years old)
4) supplementary education or learning development like Cosmotots (Cosmotots is crap btw)

And dunno what other types of children education out there, seen some digital learnings etc.

Lastly, avoid franchise at all cost. It's an obsolete business model.

Ultimately it's your investment.

Whether to take up a franchise or not it's up to you. If you got no knowledge whatsoever, then maybe paying for franchise might help to shed some lights. If you have the knowledge already, it makes no sense taking up a franchise unless it's super popular. But I normally discourage people to venture into something with absolutely 0 knowledge. Especially those who goes "I have 5 million bucks, what biz good to open?". The market can be really cruel sometimes.

Yes those supplementary or brain/learning development centers have been around for ages.