Where to start

Hi. I was looking for an new army to jump into and I considered tempestus scions.

Now, I am new to 40k and the many diffrent detachments and enhancements there are, so I am looking for advice on where to start.

I will be building up 1000 points, and want to include at least one Valkerie and one Taurox Prime. I want to lean more to the side of vehicles and heavy artillery, as it matches what I have in AoS (I play Kharadron Overlords).

So, what units would be good for me to take, what weapons should I take for them, and enhancements would be the best?