Thinking of getting into 30k, (Mechanicum)

was thinking of getting into 30k with the Mechanicum Combat Force, and a box of castallax/tech thralls and a magos as my first buys. what would ppl reccomend for a 2k list ?, iv been playing around with it using apps like new recruit but im not sure whats a solid list yet for 30k, thank you for your time !