
Firstly having chosen your design make a card template of all the pieces.
Next select the fabric you are going to use and cut a piece slightly larger than the design. Cut a piece of Wonder Web (Bondaweb in the UK) slightly smaller than your fabric.

Press the Wonder Web to the fabric sandwiching it between two pieces of baking parchment, this will prevent your iron and ironing board from becoming sticky.

Place your template onto the right side of the fabric and draw around the template.

Cut this out. Peel off the backing and place the piece onto the fabric on which you are making your applique.

Again sandwich between the baking parchment and press with the iron. The piece of your design is now attached to the fabric of your block.

I find it easier to make all the pieces and then assemble the design before pressing into place but it depends on how complicated your design is - it may be easier to do it in stages.
You can now sew around the edges of the pieces with a decorative stitch, either by machine or hand, which neatens the edges and prevents fraying and also secures the design. This can be done at this stage or later at the quilting stage.
There are several methods of applique but this is one I learnt at a recent workshop and I found it simple to do.