need some VHDL code help

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The biggest part now that I can not seem to figure out, is how do I get it to count down on it own when I press one button.

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That isn't a VHDL problem, I think.

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It still showing me numbers above 11, not sure why.

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What's your expectation for code behaviour with q = 0? An integer range 0 to 11 synthesizes as unsigned[3 downto 0]. Decrementing from 0 rolls over to 15. You need to handle the behaviour for q= 0 explicitely, whatever you want, either roll over to 11, or stop decrementing.

IF q = 0 THEN
   q <= ...
ELSE
   q <= q - 1;
END IF;