Hi App1077. First of all I would urge you to learn how to install stuff manually. This is not difficult & it helps to know where all those files are going, especially if anything goes wrong. The basic principle is the same for all the M$ sims.
Installing aircraft is surprisingly simple. Follow the instructions in this tute carefully.
http://www.simviation.com/acinstall.htmThe same goes for scenery.
http://www.simviation.com/lair/fs2002sc.htmThere are various methods for changing a panel. The easiest method would be to paste the new BMP files & Panel.cfg into the Panel folder of the aircraft you wish to install it to, overwriting files if prompted. Paste all included gauges into the FS9\Gauges folder. This time it's best not to overwrite existing gauges.
Any special install instructions should be included in a Readme file with the panel.
PS. Please ignore any advice/instructions to unzip files direct to the sim. This is the quickest way to disaster I know.