how to copy the confi from 2900 series to another one

I know we can use copy & Paste, my Cisco 2921 price    questions are:

1.       Before that, do I need to wipe out the existing confi on the brand new switch?
2.       About using TFTP, how does this new switch connects to the TFTP? Does it mean I have to assign a real IP and put it on our network? More details, pls

•1.       Before that, do I need to wipe out the existing confi on the brand new switch?
     Answer:  I always ersase the default configuration on the switch by doing "er startup" and then reloading the switch

•2.       About  using TFTP, how does this new switch connects to the TFTP? Does it mean  I have to assign a real IP and put it on our network? More details, pls
     Answer: Multiple ways you can use test network, you can assign it a static IP on the network and move the config from the other switch to this one or let it grab an IP from the DHCP and then move the config from the other switch to this one.  You can simply setup the other switch you are replacing as a tftp server to copy the config  Cisco 2951 price   to the new