Hi all, how long should I charge my s4 for the first time?? And how to ensure a good and strong battery for future? Thanks in advance

Hello everybody.. I need some help here...VERY urgent!!!!! Just now i accidentally disabled some download function on my s4.. Then it said warning disabling might cause some prog to not function as normal or somth like that..but i just click ok..NOW EVERYTHING SUPER LAG N KEEP DISPLAY GOOGLE PLAY HAS STOPPED, operating system has stopped, thing like that..cant even move my fone, tried pluck batt n reboot...still cannot ..I NEED HELP URGENT GOING TO CAMP TMR EARLY MORNING I NEED MY MOBILE PHONE... HELP PLS,,,,