I never check forums but for some reason I just did and found this so I'll answer some of the answers the best I can:
1. With mana you can:
-Prestige once you've accomplished the other requirments (This is a way to get limited cubits)
-Buy Furniture
-Upgrade your party on /p upgrades
-Lastly if you're bored and have no use for it you can always cf it
2. Pond this season is about timing, once you've hooked an item, you need to wait untill it goes up to be able to click and get the item, once its up and nobody has clicked before you, then you can right click and get the item, the more ponds you do the better you'll do the timing. It's all about practice.
3. To deal more damage to the dragon, aim for the neck.
4. Doing villager stuff is up to you if you want the trades they offer on vanilla mc, and about the carrot farm, also up to you, in terms of money this season I don't think it is that great but If you end up doing /prestige you'll need the crops harvested
well and about people cfing 100 cubits, they just either buy or farm then and cf, not much to say about that xD.
Have fun playing!