Hi everyone I need some help please, I want to retrofit my Bridgeport series I Interact to Mach3 or whatever you suggest is better but I have very little electronic experience, can anyone give a step by step guide on this project. I would also like to change this machine to single phase?

Mach motion seems to be the game to go for us know nothings.  If you wanna risk it and learn some electronics get a O scope and try your hand at different shielding and grounding techniques.  I am selling 4 SEM servos,  4 DG2S16035 drivers, power supply, C32 BOB, Ethernet SS, relays card, and computer with Mach3 and VFD for that spindle motor and everything else in control cabinet for $1500 you pay shipping.   

look up past posts where people have already done it

Then I would have done it....where are they?

If the servos and amps are good I would look at one of the controllers that can handle analogue command.
One I have used is the CSMIO/IP-A
There is also the DSPMC and then the Kflop with Kanalog board.
Hood