"what type of microphone would be best to use? "

Normally, the brief answer to that has been 'the best you can afford', however these days I have noticed what appear to be 'Chinese made' plasticy looking mikes intended for 'karaoke' style use which are amazingly cheap. I don't know about the quality, has anybody tried them seriously?

You will also get lots of varying advice on all sort of construction types of mikes, which various people swear by (and some at!) for various purposes.