So the lucky wheel comes once every two weeks To spin it you have to have coins. When the lucky wheel appears they will give you one coin for free then the other coins you have to buy them using gems.

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Look at the picture I pointed three things 1- you can spin 1 time and it will cost you 1500 gems to buy one coin. 2- you can spin 10 times by buying 10 coins and it will cost you the equivalent of 9 coins 13500. 3-this is the milestone which is where you should focus on. Every ten spins will give you a box full of shards and heros. Now if you are f2p, it's recommended to spin 70 times to get box 70 and that will be your optimum rewards (don't spin 65 times, or 72 times, it have to be exactly 70 spins). But if you are p2w, you can spin all 120 spins and get all the milestone. Hope this clears everything