More newbie questions!

Hi all - a couple more questions from this newbie gardener: I'm thinking of getting one of those stand-in-the-ground birdfeeding stations, as I have a large rat who gets into my feeders near the hedge. But my soil is not great. Would this be a problem? And should I get one with a concrete base instead? And secondly - I keep reading about 'mulch' and some say to use bark chippings as mulch and others talk about using compost as mulch. Which is best? I have very poor soil so want to give my plants some nourishment and moisture. Thanks! 

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I use compost, homemade if possible though I never have enough, and leaf mould for flower beds. The compost also provides some plant food and improves soil.