HELP, bought a new t.v

Just a question as i know nothing about the techanical side of full hd, standard hd and soforth. We bought a t.v which while watching in-store looked absolutley magnificent, since we bought it and got it home we aren't seeming to get the same picture quality we saw.
The t.v we bought is a 54 inch Panasonic plasma model number being TH-P54S10A. It say it has
-full HD 1920 x 1080p
-HDMI
-DVB
-AVCHD
-Viera Link
-HDTV
-viera image viewer
All this means nothing to me so my question is
1/ Have we bought a decent t.v?
2/ what will be the best set-up settings considering we have to plug in Foxtel and DVD player eg, should we put foxtel through AV or HDMI and soforth?
Like i said i know nothing about t.v so any advice in as simple terms as possible would be hugely appreciated including beers owed to you at the SANFL this season.
Will add i have read the instructions but they don't offer alot of assistance that i can understand.
The t.v we bought is a 54 inch Panasonic plasma model number being TH-P54S10A. It say it has
-full HD 1920 x 1080p
-HDMI
-DVB
-AVCHD
-Viera Link
-HDTV
-viera image viewer
All this means nothing to me so my question is
1/ Have we bought a decent t.v?
2/ what will be the best set-up settings considering we have to plug in Foxtel and DVD player eg, should we put foxtel through AV or HDMI and soforth?
Like i said i know nothing about t.v so any advice in as simple terms as possible would be hugely appreciated including beers owed to you at the SANFL this season.
Will add i have read the instructions but they don't offer alot of assistance that i can understand.