If your app works in your simulator and device and you want to send it
to others:
Right-click on the project name in Eclipse > Android Tools > Export
signed... and start filling out all the screens. When you come to
something you don't understand, copy/paste the text into Google and
get answers.
When the process is done, you'll end up with a file that ends in
".apk" and that's the file you'll send to the others. They will load
it onto their cards, plug it into their devices, and tap on their
settings and get it loaded.
These steps do not absolve you from reading the extensive
documentation found at
http://developer.android.com/index.html
Regards,
Steve