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The width of an auxiliary lane should be equal to the through lanes. Where auxiliary lanes are provided along freeway main lanes, the adjacent shoulder should desirably be 2.4 to 3.6m [8 to 12 ft] in width, with a 1.8m [6 ft] wide shoulder being the minimum considered.
For rough estimates 9'-0x 18'-0 per space is a minimum. I usually use 10'-0 wide road lanes just to make things easy. If you're backing straight out, 20'-0 is a good distance. Once you get into angled parking, loading zones, handicapped spaces, etc., it helps to have one of the above references.