seeing the limitations, I would get a ravager, a heamonculus, warriors and raiders. it's the best army you can make.
You bought 3 fast attack choice, they're fun and cool looking, but not very smart considering the battle limitations.
Wyches sry got a little worse in this edition, to the point they are maybe our worst troop choice, the lastest cc rules messed things up. wyches need transports if used, wyches cannot move around on foot, just no, warriors can, wracks or wyches can't.
Best advice I can give you: Read the codex, read the rulebook, over and over again, honestly I still do myself, purely out of boredom and enjoyment of the stories themselves.
After you've done that, come back on the forum, check other threads, check out what people use, what people recommend.
It's a lot of ask, but if you love 40k as much as we do, you'll actually enjoy doing all of this.
Painting the minis is another hell some of us enjoy going through.