No to gluing threaded fitting. What's threaded?
Are you talking about using spa tubing for the return? Go with the hard tubing. Glue for things under pressure, like the return. I know everyone seems glue for drains, but I honestly don't see the reason/need for it....... I suppose erring on the side of caution.
Ball valve at the input and output of the pump in case you have to remove it, and also at the bulkhead drains to stop flow before the water level drops. Add one anywhere you think you might want to stop or slow flow. Like a seperste drain into the fuge...
Sorry, no idea on the pumps. I didn't see a gph for the second pump. I would put the smaller on the return so your fuge and skimmer have more contact time.
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