@Kyle Bryant you're probably looking at a sliding scale. Here are key components to being a deal sponsor not necessarily in order.
1. Investor data base and ability to raise equity
2. Relationships with lenders, brokers, property management, etc.
3. Net worth
4. Experience in underwriting
5. Experience in operating
6. Experience in RE in general
Obviously there can be more to add to this list but it will all depend on the reasons of why you need a co-sponsor. The more items you need from the list then essentially the more you will have to "pay" with equity. If all you are doing is just bringing a potential deal and expecting to co-sponsor to hold your hand through the whole process then you're looking at a very SMALL piece of the deal. Maybe 1-2% if you find a deal that works for the co-sponsors investment criteria.
At the end of the day everyone has to start somewhere. My advice is to not be greedy and chalk up your first couple deals as education. Aim to provide value and you'll find your way. I'm always fond of the school of though that a small piece of a large pie is better than a large piece of no pie.
Good luck!