Garden Insects

What can I plant to encourage more bees to my garden to pollinate my plants and trees in a fairly hot sometimes dry region? For winter and summer. 

My daphne smells glorious but looks really scruffy. Can I safely prune it and if so how and when?

How can I attract butterflies to my garden? What plants do they like? I tried growing swan plants but haven’t had any success. What conditions do they need to grow?

I would like some suggestions on what to plant to attract the ‘good’ insects like bees, ladybugs and praying mantis to my garden.