I applaud you for getting a rescue. There are tooooo many out there. For a first timer, an older one would be good, at least 18mos old or more where their personality is who they are at this age. Research all you can, and if you fill out an application and are denied, no not stop trying. I was denied by a Basenji rescue, and Uzie is my second where I found him right here 'free to good home' so we drove two days to pick him up and he is thriving without fenced in yards. (not for everyone as not everyone lives on 10 acres or more…I get this....!) but he has blossomed and doing well. So, don't give up!
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