Hello McBuckers.
God, we have endless tips between us I think.
Mine are not to get too carried away with talking online etc.... meeting in person can change everything so get that done reasonably quick
Also stick to an hour max for coffee and have a get out excuse ready just in case, so you don't waste too much time if they are awful.
It's likely you'll need those two in the early days until you get to more easily spot the way people disguise things (soft focus pics, not smiling, no pics with friends, only overhead pics, etc)