fordtruck2004

Hey trying to lift my 2004 Ford F-150 I was looking to do a 6inch lift but not sure what to use. I was looking at rough country but they are kinda high in price I was also looking at rancho I just want something to get the job done. Once it's lifted what size tires could I should I get for it. I like how on some trucks the tires stick out a lot. Lastly what do people mean when they say back spacing. Thanks