I would advise you to let your hair grow at the sides & back a bit longer.
This will help with blending and give a better idea of the density.
They look quite thin as they are but that could be because of the lighting and how short they are.
The hair also looks quite coarse. Is it?
Does it curl or frizz when its longer?
What sort of style are you aiming for with a hair piece?
Would you want it swept back like in the last picture?
The answer to that would determine what base and hair direction you should have.
It looks like it naturally wants to come forward.
I would recommend a short brushed forward cropped hairstyle to begin with.
This would be easier to maintain and be a more natural transgression from as it is now to longer hair as in your last picture.
I would make your template around the hairline you currently have because it suits you.
Your temples haven't receded and your 'peaks' above then are still quite low on your scalp.
To achieve this picture below you would want about a 55% density in a black hair colour (1B) with forward ventilation.
I don't know about curl or wave for you as I can't tell from your picture. But the attached picture would be at least a body wave.
Because the style below doesn't expose the hair line, you could have a poly skin base.
You could also go for a lace base. With this style base choice would be dependant upon your preferences & lifestyle.
I've also attached some pics of your template area.