I am completely lost in terms of team building, progression and over best way to help my Childs get stronger in general... Is the timed packs with cards and children worth it?
There are 2 newbie packages with 100k crystals (first one with 120 blood gem and 240 for the second) within the first week iirc, those are the best value you can have in game if you want to spend some money.You can join the discord server to get gameplay related questions answered, that ways is much easier.
The best advice I can give is to use this website...http://riceminegl.mnyiaa.com/It's a tier list that you can filter depending on what game type you're focusing on.Also, you can totally have fun with this game without spending money. If you want to be at the top, that's another story.Good luck, and have fun!
Find all the best 5☆ units and make them a priority. Everytime you get one, look them up, some are must haves.If you upgrade every unit then it'll take forever for you to see desired results in boss battles and PvP.
Check this out. It's a bit dated but not too bad.https://moot.us/lounges/73/boards/289/posts/5407788/a-priority-list-for-newcomers-updatedSave resources, don't gold summon too much, or at all, or else you'll have complications. See if you can chill at 15 million gold.For exploration mode, send 25 of the 2☆ Childs for 19 hours and you'll get 500 crystals. When done the 2☆ units will be capped at level 20. Then extract onyx from them all.