ok i have a lot of questions here (YOU CAN SKIP READING THIS IS YOU DONT FEEL LIKE READING IT

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i was hunting today in my blind, everything was perfect. i had out all of my buck and doe estrus scent, i had a scent trail, i was not cold, i wasnt bored, all my clothes were scent free..........but anyway back to what i was gonna say

i was out for a couple hours and i just put down my bow for a minute, and a little doe comes walking across the trail(where i am hunting is im in a blind on a fenceline and there is one big 20 ft wide trail facing the front of me and a smaller but still big one to the right and in the middle is some brush) . i tried to grab my bow in time but she already walked away. about an hour later another doe walks out and im ready. i think its about 30 yards and use my 30 pin and shoot and miss. then out pops another one and i didnt have another arrow nocked yet so it went and then abother one i missed again. i was pretty mad becasue i thougth i hit the second one but i didnt. well i went out to see if i could find my arrows and they were both low. and it turns out the spot where the deer walked by was 48 YARDS!!!!!!!!!! i was way off.
so heres the questions:
-if im hunting and theres a deer broadside 50 yards away how do i get it to come closer? before it goes into the brush?
-how do you estimate how far away a deer is?