phd offer without fund

[matinaf]

HI everyone !

I just received an admission offer to a Phd program in US for Fall 2017 last week without any funds. As classes start today, I accepted the offer but planning to defer until next Spring 2018 until I secure full funding. As I applied late, I assume I didn't get funding. I even contacted one professor before  & after being accepted, but he didn't have funds this year. Should I keep contacting him or other professors too ? does it look unfocused contacting multiple professors ? Also, which one will be better, deferring a year or a semester ?

Thanks a lot, hoping for your advice