How to decide stakes in a partnership?

I am looking to level up my consulting/freelance business by forming a partnership with one other partner. I have had 3 people interested in partnership but I am worried as I do not know how serious are they. It’s all nice when they are very enthusiastic but I do not know whether they can do what they claim can do. As I am looking for a partner who is better than me in Business Development skills all these 3 posses them in varied aspects. So let’s say I’m taking one of them as a partner. His stand (Let's me explain about one of the potential partner) Here’s what I know about his profile. He is around 20 years older to me and has been working in SME as a Head of Marketing. Has several contacts (which he claims; He has introduced me to some - but all of them appear to be on the same boat as us). He’s been begging me to start the partnership with him on a 50:50 basis. He has agreed to pay 50% in setup costs & take 50% revenue earned through this business. He appears to be tired of getting business for someone else & wants to run his own business. He doesn’t have in-depth understanding of my business but he claims he has the knack of fixing a meeting with these clients in favor of my business. My stand: I have been consulting 2 clients over the past two years and have been doing side projects as well. 2 Months ago I introduced the new business to my existing clients so that I could associate their name with the new company. Very recently, one of the nationwide events highlighted the business name to a large extent in the industry. I am also promised PR offline for this activity which is happening right now. I currently take care of all the management of this firm & also focus on bringing in business (This part is really slow at the moment but I have been optimistic for 3 months now - My business majorly works on a retainer model where are charge about $600 month/client.) I have already built a website for the new business & I have invested in products worth $150 each. Partnership Roles If we are to go into partnership, we have agreed that my current clients won’t be a part of the new partnership firm and will continue to be a part of my own personal clientele. However the names will be associated with the new firm His role will be to leverage his contacts & get me a meeting. Then I take over the meeting & focus on conversion. Once I handle conversion, I will be looking at delivering the business services by putting up a team & training them accordingly to the new structure I design. (None of which the other partner will be focussing on) My questions: This does’t appear to be an easy 50:50 contribution. How should I distribute the stake? We are sharing our costs equally, but should I be sharing revenues equally? How do I deal with a situation wherein business that converts comes from my contacts & none from his? Does he still get to take a share of the revenue of the firm? Is there a better way to work out a deal? Do I add him as a consultant for a test period & give him a small stake cause I do not know how well he can perform & I cannot pay him a fee?