Need help setting up my sequence

hi, i'm new premiere , making short film.

i'm filming canon 600d, produces .mov file (which i've heard nortoriously hard work with). frame width 1920 , length 1088. shot @ 25fmps.

when attempt create settings of sequence preview clip cropped original ratio, that's 1 problem.

i think maybe i'm entering in other mistakes sequence might reduce quality (i don't know how works).

i guess i'm asking should pick for:

editing mode

frame size

fixed pixel ratio

preview file format

codec

and other important ones.

also, i've been told should use cineform.. (my computer can't handle previewing files) effect these sequence settings also?

i'm green, eager knowledge.

if can me, take load of stress off..

thanks

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