Am i able to bring in my 5s and trade it for the 6?? If so what would the price difference be?

Apple does not do a trade-in program. They have a recycle program, but the amount received is very low, so you are better either selling the device to someone, or check with your cellular provider to see if they have such offers.

Apple doesn't do trade-ins. They will give you something for recycling it. You would do better selling it on eBay.

No, you cannot trade in an iPhone for a different model with Apple. Some carriers will allow a trade-in; you need to ask your carrier. But generally you can do better selling your phone and buying a new phone. You will get more money selling it privately than you will with a dealer, who must make a profit on the exchange. But before selling it don't forget this: What to do before selling or giving away your iPhone, iPad, or iPod touch

You can take your iPhone into an Apple Store for an immediate credit toward the purchase of a new one. See the quote below from http://store.apple.com/us/browse/reuse_and_recycle

You can also bring your iPad or iPhone to an Apple Retail Store and we’ll give you immediate credit for its value toward the purchase of a new one.

As the others have said, you may do better elsewhere. You can also get an estimate from Apple's recycling program using the link above.