I'm a biz dev & marketing guy with a development background and about a year ago I started coding an idea. It took shape and I mentioned it to an ex-colleague / friend. He was extremely unhappy in his day job and was very interested in what I was doing. He's a product manager, but with development experience. So a couple of weeks later I asked him to design & code some web screens. It was all very loose at this stage so no terms were discussed.
Meanwhile, I named & registered the company, made the website and did the marketing etc. on my own.
The product is starting to get a lot of interest, but my "partner" is still wrapped up in his day job and is having problems delivering changes to prepare for the product demos. I'm the guy out there doing the demos.
Long introduction, easy questions:
How can I convince him that without 100% commitment we are probably not going to succeed quickly / at all? He has a wife (no kids) and an expensive apartment and has said that he needs a salary before he can leave his day job. If he doesn't quit should I find a web-developer to make the screens for me and look for a new co-founder?
If / when he does leave, what kind of equity split would be fair? As I mentioned it was my idea & I put the initial work in, but he's a good guy and brings a lot of skills to the table (sales, marketing, product management), so he wouldn't be the web developer for long.