I cant download any apps and cant syng my sd card on my samsung galaxy core?!

[AC Question]

Ok So I rooted my phone yesterday and I was already looking for ways to sync my sdcard cuz my internal storage in full. Only 435 mbs are left out of 4 gb. How do I move app in my phone to my sd card and can I backup any apps on my laptop ( I have linux ubuntu on it ) ? There is ni "move to sd card" option in the Settings > application manager > (app name). Under storage heading.