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Universal gravitational constant = 6.673e-11 N m^2/kg^2

Radius of the earth = 6.370e+6 m

Mass of the earth = 5.980e+24 kg

I know to use the equation U= - (Gm1m2)/ r

I also need to take into consideration that r is the radius of the earth and the object is launched at the surface of the earth. However how am I suppose to solve for height when their is no mass of the projectile and what do I do with the speed of the projectile. I originally thought I should consider that U=mgy but that got me nowhere. Any help will be appreciated I'm literally teaching this to myself.