I couldnot start my phone after I rooted my phone?

Congrats, you have offically bricked your phone. But do not fear, there is a fix. I am not sure of the details. First try to do a factory reset on your phone, I do not know how its done on a samsung so google is a thing. If that doesnt work then you will need to download a program that will install software to your phine while it is inoperable. Second download will be your phone's files. You can find more on this on other forums. Just use google to find what you need, thats how i fixed my Optimus F7 after i rooted my phone and installed chainfire (graphics boost program). People like me and you shouldnt fiddle with tech we dont understand.