John

First you asked, "if a theoroetical object with no mass had an unbalanced 
force apllied to it will it accelerate to the speed of light?"

What you are describing here is light itself. A photon, particle of light, 
has no mass when stationary. It is said to have zero rest mass. When a photon 
is created it travels a the speed of light. Anything that can be said to have 
mass can not be accelerated to light speed due to the restrictions of the 
Lorentz Transform and Special Relativity. But, according to General 
Relativity, gravity still effects a massless object. Any particle in space 
must travel in straight lines, called geodesics in the language relativity, if 
no force is applied. These geodesics can be `curved' due to the effects of 
another mass. To fully appreciate this I would strongly reccomend reading any 
general level book Relativity. One of the best I have heard of, but not read, 
is "Gravitation", by Charles W. Misner, Kip S. Thorne, and John Archibald 
Wheeler, Cambridge, Mass 1972. A better book may be Einsteins own general 
level text called "Relativity: The Special and General Theory". 
It can also be found on line here

Then you asked, "the device made by a
russian which he claimed could reduce the mass of an object by ten 
percent does it work and if so would ten devices reduce the mass to 
would anything with in the effect experiance inertia?"

I suspect that it does not work. No reputable physicist has yet to show 
conclusive proof to the Physics community worldwide that an `anti-gravity' 
device works. To use Carl Sagans oft used phrase, "extraordinary claims 
require extraordinary evidence". I so not believe this has happened in this 
case. Anti-Gravity is generally thought to be unachievable. Some theoreticians 
have tried to model it, but the conditions and requirements are so bizarre 
that no sensible machine could be built to create anti-gravity. You need 
things like negative energy, whatever that is.