Hi there, I'm new on here so please be gentle

I was wondering if anyone could recommend a decent wireless tiepin mic? I have filmed a few friends weddings with just the camera mic, but have now been asked to film a colleagues' wedding so want the sound to be a bit more professional. I have a Panasonic NV-GS400 so don't know if a decent directional mic would do the job instead? Any recommendations and advice about how you actually set up the mics on the day would be appreciated .. thanks, e