A solar sail is an object/probe that is pushed by the light of the sun, thus pushing the probe forward.
Because light is made out of photons, which don't have mass, but have momentum thus, each time a photon bounces off the solar sail it gives it a small push.
The answer is that my probe will have constant light from the sun, thus it it always accelerates and will never slow down.
I will use a High Gain Antenna (HGA) because it has proven itself to be as efficient as it was how people communicated with the voyager probe, the furthest thing we now in space thus, it must be efficient.
My solar sail is going to be made of a thin layer of aluminium foil coated on a thin plastic sheet.
I would probably need these things:
Laser cutters
A 3d printer
A big workspace
Lots of metal
Lots of aluminium foil
A launchpad