0-15 counter

can you help me start of guide me on how to start it this is what i got so far

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity up_down_counter2 is

Port ( CLK : in STD_LOGIC;

DIR : in STD_LOGIC;

LED : out STD_LOGIC_VECTOR (7 downto 0));

end up_down_counter2;

architecture Behavioral of up_down_counter2 is

signal clk_div : STD_LOGIC_VECTOR (5 downto 0);

signal count : STD_LOGIC_VECTOR (7 downto 0);

begin

-- clock divider

process (CLK)

begin

if (CLK'Event and CLK = '1') then

clk_div <= clk_div + '1';

end if;

end process;

-- up/down counter

process (clk_div(5))

begin

if (clk_div(5)'Event and clk_div(5) = '1') then

if (DIR = '1') then

-- count up to 15 then stop

while (count < 15) loop

count <= count + '1'; -- count up

end loop;

else

-- count down to 0 then stop

while (count > 0) loop

count <= count - '1'; -- count down

end loop;

end if;

end if;

end process;

LED <= not count;

end Behavioral;

but this does not use pushbuttons how do i implement pushbuttons and without a timer