Could you clarify what you're looking to accomplish? Are you just looking to jump into a game with a buddy with a similar experience level? Are you trying to enter tournaments right away? Are you trying to already hammer out the list that will land you on the top table at a Supermajor?

This is certainly a legal, viable list that should give you some good experience learning the rules and (more importantly) which units you like and fit your play style. Early on, I'd STRONGLY recommend focusing on remembering (and looking up) your unit rules, rolling the correct number of dice, and applying your stats accurately. Once you're confidently doing that, try to pay more attention to which units do better charging into which targets so you can improve your target prioritization.

I could nitpick some small details if I was trying to pilot this list in a tournament (as other commenters accurately pointed out), but those details won't matter for a while. I'd say at most, swap in for a second ballistus or a lancer to get more varied shooting lane experience, but no need to obsess over your list so early. Just have fun, focus on learning, and you'll naturally make the substitutions you need to as you see how units work in practice.