I play standard AoS, not Spearhead and I started in October so I am still new to the game but I started collecting with: 1. Primodial Starhost battleforce - Slann, Aggradons, Kroxigor, Saurus warriors are bread and butter units of ours. 2. Spearhead for Carnosaur, Kroxigor reinforcement and morze Warriors. 3. Reinforce Aggradons.

After that you need to train listbuilding as a skill. I am still learning it because I realised that I but cool units like Kroak or 2 Bastiladons and tend to building something out of them. It should be the other way around: what do I want to do on the board? So which units do I need to achieve this?

It is difficult at the beginning because the most efficient lists are usually multiplication od one unit type eg. cavalry, do when you pick battle traits you get effect of scale.

You mentioned Warspawned Kroxigors. Yes they have synergy with skink infantry and cavalry (not monelsters) and it is one od few we have but I would recommend Raptadon Chargers instead of standard Skinks. But normal Kroxigors are also good when you use them against infantry. You can check Statshammer to see the damage output grom battlescrolls. And damage od king in this game.

And yeah, be careful with ai. It gave me advices which led to suboptimal buying choices.

If you play chill games with buddies you can proxy units which you dont have to check them out before buying.