Documents i should get from motorbike showroom after vehicle registration with RTO (Mumbai, India) along with Vehicle registration number?

Dear friends,

My new bike is being registered with RTO & i am getting my final registration & documents along with number tomorrow or day after tomorrow. But i want to know which documents along with registration number i should get?

1. RC Book (Showroom guys said it will arrive after 1 month to my postal address)

2. Insurance papers & certificate

I am aware of these 2, please guide me which others i should get.

I heard something called road tax paid certificate, what is it? Please help me to understand, also someone told me that Showroom guys can fool someone by paying road tax just for 1 month & rest should be paid by customer if not checked properly.

Please help me!

Regards,

Endless Love.