Really URGENT! How do i sync apps from iTunes to my iPhone 5?

This is urgent.
I have a iPhone 5 and i'm using iTunes to install apps from iTunes to iPhone 5 as i have no data on my iphone. I have connected my iphone and signed into my Apple ID and then i go to the app ad click download then i check my iPhone and it is not installed.
So is there any thing else i need to do? And how do i do it. Please explain setep-by-step as i have recently got this.

Go to apple support communities. If the answer isn't there check the official website. If not there either there are numbers of people that can help on the sites.

Do you have money or credit card on your Apple account?
Are you using Wi-Fi as you have no data?
Are you using the computer? If so you have to sync apps to the phone.

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