Is it a restriping job or will you be doing a new layout?
What type of paint will you be using?
What surface will you be striping(asphalt, sealcoating, concrete, etc.) ?
What application equipment will you use?
Will you be painting curbs, car stops, ramps, - if so, how many?
Handicap spaces?
There are regulations and guidelines involved that you must adhere to.
As you can see, there are alot of variables in pricing this job, but one thing I can tell you, without the right equipment, materials, and knowledge you will be getting into something that might not be worthwhile.
I can help you out if you want - but I need a little more info.
BigPete
Hurricane Services
Tampa Florida