What should a newbie check for?

I was hoping to get some tips and pointers that can help me choose the right place to train judo.

I'm trying all the places near me, but since I don't know much about judo it's hard for me to see if the place is a good judo place or if it's just friendly ppl.

So do you more experienced ppl have some advise for a newbie? It would suck to train at a place for years only to realise that it was a bad place.