1) Upgrade Gold Mines & Elixir Pumps first!
2) Upgrade Gold & Elixir Storages second!
3) Farm and attack all the loot you can!
4) Plan upgrades and keep builders busy!
5) Upgrade Troops & Army Camps!
6) Don't rush your Town hall (after Town Hall 4 mainly)
7) Build new structures before upgrading old ones
8) Clear that debris for Gems & XP!
9) Attack for loot & use farming strategy