How to balance school and work hours?

Okay so I start college for the first time in August, but I haven't gotten my schedule yet until I'm finished getting my transcripts and doing financial aid. I'm applying for this job that is going to be hiring in July but I don't know what hours to put on the application. Since its summer time do I just put a regular 5 or so hour time mark and then change/discuss the different times once August comes around? I don't have any experience yet so I really want this job but I'm just so confused about everything lol. I don't know what hours to put and if it will conflict with my school time =/