new to car audio

Honestly that would require a little bit more information on your part for me or anyone else to be able to help you. Are you looking to add more bass to your car? Maybe replacing your stock speakers and head unit for aftermarket ones? Read  the stickies on Ohm's Law and some of the others they were very benificial to me and I learned things that I didn't even know about and I have been bumping for years. But please if you can afford to go somewheres besides Walmart and get your stuff dont go there. I know this may sound hipocritical since I myself purchased my temporary head unit there. Just dont go and go get your whole system there if you are really looking for performance. If whats there fits your budget and you are fine with getting rather below average equiptment in my opinion go ahead and do it otherwise if you can spare the money or maybe even save for it go for something better which that in itself is an entirely differant conversation.

I want to learn like how much power is in the speakers, sub, amp n headunit before connecting it togerher and then after connecting it i want to make sure if its all compatable. I really am trying to put it my own words but its kinda hard so plz bare wit me.ToO EaZy

speakers and subs don't have power in them. They can handle an amount measured in watts. RMS which is nominal and max which is peak rating. A head unit puts out power and so does an amp. Again look for the RMS watts to determine what they are capable of putting out at a givin load.