villain unknown, just joined the table and this is the 1st hand vs him

Is calling this ok vs a complete unknown, especially given that he could 4bet a little lighter than usual expecting me to 3bet slightly more bluff heavy the first times?

What now? Even though this board looks better for my range at first glance, I don't think I have 99 whereas he can and he has more overpairs and strong FDs whereas I'm capped at AJ or the rare J9s, AA slowplay. Is this a check back? If it's bet, how do we deal with a c/r? I'd feel somewhat committed but expecting to be pretty crushed by his range then.