Assigning TileLocation to a TRect

Good Morning,
      As a total beginner to Delphi, I have as usual "bitten off more
than I can chew".
 I have been given some information by a Delphi coder and am trying to
get a graphic sprite routine to work.
How do I set FinalLocation to a TRect, and get the coordinates into it.
I tried all ways and with no success.
The idea is to load up two screens into Image, one is a B&W mask for the
other and then blit them across to another, flip it and start all over
again.

I did look on the web for utilities, ( DelphDeli, Delphi Super page) but
some are Fixed so they do not work or too complex for me to understand.

Many thanks

 Jackdaw