IMessage and regular text messaging?

Can you block regular text messages, but still use iMessage? This is because I don't have a text messaging plan and would therefore not want to use the regular text messaging on my iPhone or to have to pay for text messages sent to me from non-apple users. OR If i switch to iMessage on my phone, would I not need to block the normal text messages at all because i would just simply not receive them(and therefore not need to pay the.20/text)?

Yes you can the I message is used in Wi-Fi mode and not on data plan just make sure your inernet is on.

Yes go into your iphone settings. Click messages and there should be an MMS and SMS option, make sure these are turned to OFF and the iMessage is turned ON

Yeah you don't need a text plan, but you can use imessage over Wi-Fi.