Learn to farm and you won't need to gem. Collectors are a waste of time.
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After you are done with maxing out, don't hesitate. To be honest, at 1500 trophies, farming is actually quite great(due to summer inactive bases). I have found some raids today that have been up to 500k gold and 500k elixir.. Rare, but nowadays finding a 200+/200+ raid is quite easy. Stay at about 1560-1600 and your golden.
Also, once you can hold 220 troops, use this army composition:
8 giants.
8 wall breakers.
44 goblins.
60 archers.
60 barbarians.
Works great for me. Best army composition I have ever used. Hope this helped.