How do I get it to stop saying forces close

well my phone keeps saying force close and wont let me do anything with it expect to shut it of and i would like to know how i can get that to stop it says sorry but google play has stopped and pops up on my screen for all the apps i really need help please it my only phone for me to get a hold of my kids i havent talked to them in two weeks because of this problem and i would love to fix it i have done everything i can with it and i dont have the money to buy a new one