Default [Q] Micromax Ninza A91 rooting (MOD)

I have a micromax a91 ninja and i dont know much about rooting a phone the features of my phone says it has a ANDROID V4(ice cream sandwitch) so after i root my phone will i b able to upgrade it to a higher version lyk JELLYBEAN.....?? should i root my phone....?? one of my friends told me that ROMs are not available for my that true?? plz help