My first CNC machine build - Help and advise gratefully received

[Clive S]

Steve. Please don't go down the route of buying the electronics until you have decided and built the frame because as you learn (like we all have done) your goals will change.
That kit you pointed at will not be enough to build what is in the picture, as in the pic it appears its using rack and pinion drive system with the gear boxes on the motors etc.
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CNC4YOU.CO.UK is a good company to buy the motors from but I feel you can do better buying the ball screws and rails, power supply etc. else ware.
In the kit you show 4 motors but three ball screws !! and it would be more usual to use 10mm pitch on the X & Y axis and 5mm pitch on the Z.
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Keep asking questions no matter how silly and the good people here will guide you through the minefield.
Put a sketch up here before you buy anything. ..Clive
(Edit I missed the Z screw)