Help 50/50 split

So today I received a call from a window tinting company asking if I'd be interested them subbing some window cleaning to me. I said sure, I'd love to talk more about it. We chatted for a minute and are getting together tomorrow to discuss it all. Basically, they're going to market it and just pass it to me when it comes around. He mentioned splitting it 50/50. I feel like that is a bad deal on my end. I was thinking more along the lines of 70/30. What have you worked out with other companies like this in the past? Anything I should know before I go meet with him tomorrow? Is they're abutting I should make certain to have in the deal? Any other helpful info is much appreciated.
Thanks

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