I'm on my second day I'm finding forges and guilds worked well for me. Started with 2 rows of guilds and the rest forges when I upgraded them all to level 3 I converted the rows of forges to 3 sub factories (level 3) and everything else to level 4 guilds. I use a mithril to insure I can compete in all the group missions (clan advised me to buy 6 when I was small and weak so it cost less) I'm now converting 2 of my my subs to level 2 hatchery and the other one to a guild. Also make sure you have a really expensive ally this makes you earn more money like a lot more! Took me a bit to figure out it isn't the amount of allies you have but the value