Im overweight and i have Sleep Apnea ive been breathing through my mouth my whole life and when i talk it sounds like my nose is permmanently clogged i really want to breathe through my nose eventually? Does any one have any help?

There are three types of apnea: obstructive, central, and what they call mixed. No matter which type, people with untreated sleep apnea stop breathing repeatedly during their sleep. There are different causes but one major one is airway blockage.
Sleep apnea can cause a myriad of other problems such as high blood pressure and other cardiovascular disease, memory problems, weight gain, impotency, and even headaches.

I was diagnosed a little over a year ago, and started a CPAP machine which has been really helpful. You should check out this site. They have a really helpful resource section, too.