How to remove billing information so I can download free apps

There is no need to do so if they are free apps. The very nature of "free" indicates no charge, so unless the billing information is incorrect, there's no need to change it.

but it is saying that my billing info is incorrect so im not able to download anything

Thats because you've created yOur Apple id from a phone or from the website ......

Create a new id using itunes and when it comes to payment method select non .. :) hope it works out for u

I need to also it wont download any apps because of billing information.

are you asking how to download appl without putting in your card details easy just select a free app click download then will ask you for your details without asking you for your card details thats the i set up my and my friends phones for them