8th grade boy wants to ask a 7th grade girl out, HOW and WHENS the right time?

I need the most in depth help! See, I like this girl, we talk, we both flirt to eachother, looks like i gotta be the one to "pop the question" So, I really would perfer to ask by text, because the only class we could possibly have together, and do, is gym. (Not the ideal place) How and whens the best time? School ends in 2 weeks, dont think that is a factor...Answers immedeately and more the merrier!