The holes in the bottom can be made with a jack hammer or a hammer-drill (with a 3/4 - 1" drill bit) - if you have a plastic main drain you can just pound out the bottom with a sledge hammer and have a few more axillary holes, here and there.
Screened fill is fine (I just figured that unscreened would be less expensive) and you would want to 'roughly level' it and then let it settle before adding whatever amount of top soil you want.
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