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I just got into 40k Killteam, I have some of the Testor flat acrylic paints and was wondering if anyone knew how much I had to dilute them with water, I am new to painting and use to just go straight from the bottle, I know with some brands that is o.k. didn't know if that was true with Testor or if I should be looking for a different brand to paint with anyway, I have seen people say yes and no to using Testor.

Okay, if it is acrylic, adding water is answered with "that depends".
The model is primed correct? (black, white or grey or one of the fancy coloured primers).
Good surface to stick to and not likely to have contaminant (do not touch model with oily fingers or paint will bead off).

Most people direct adding drops of water till it has the consistency of milk.
Typically for new GW paints I add a drop of water to about 6 drops of paint.
I think Testors runs a bit thicker if I remember correctly.
I find the limit is what you can handle to coat and not have it run everywhere (self levelling and not sag on curved surfaces).

My "cheat" mix is a 1:1 mix of "matt medium" (~2oz) and distilled water and a drop of "flow aid" that I dip my brush in (decanting a small puddle on the side) then paint.