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I am writing a codex, I wont say what for as it may distract for the issue in hand. Could I have some hints and tips on the best way to go about this?
Compare stats and point costs to other codices, then probably add a couple points on top for whatever you decide. So for example, if you create something in between a Space Marine and an Imperial Guardsmen, it should cost approximately the median points between the two, plus a few extra for making your own thing (possibly). Add in special rules and equipment choices and the likes... etc. Just balance it out against the units already created.
Lost Nemesis pretty much summarized the best way to do it. Take a unit that is almoast equal to the unit you had in mind and then work your way from there. One piece of advice, it is always better to make things overpriced then after the first playtesting you may find that you need to make the unit smaller.