As the title suggests: I need a new business partner.

I decided to start a business. I have the technical skills for the job but I lack actual marketing and strong human skills (I'm not good at convincing people to listen to me or breaking amazing deals).

I had a not so close friend that's really smart; his degree and all of his jobs (current one included) are in some sort of branch of marketing; on Saturdays he does workshops on communication skills, body language, etc.; he knows just enough graphical and web design to know how to make a great site and a great banner if he has one in mind; he is in the capital of our country (a ton of potential clients) and he's dealt with both people and companies alike and knows how to get along with them (great for attaining potential customers, business partners/ investors). He was perfect for the job! Except for one thing: he was too busy. He's working after hours to help some 40-50 y.o. writers launch their books, prepares his workshops, is trying to write his own book.

We started; the first few weeks were ok: I built the infrastructure, was gathering what tools we need, was researching what kind of people we must hire, how much money we need and how much we must stay afloat until the first cash would come in, what exactly are we targeting with our product, etc. He started thinking on the promotional packs, catchy phrases and a spiffy name for the company.

Then after about 1-2 months in, he wrote me out that he just doesn't have enough time to work full gear on this and he'd only slow me down since my side of the job was slowly getting to an end (I'm roughly 60-70% done; then I'll have to wait for the first clients before I need to get involved more) while his was barely beginning (10-20% done).

How do I go about this? Where/ how am I supposed to start searching for another partner? How can I make sure that the new guy ain't gonna steal the idea/ company?

No, my friends are all out of the question since they're lazy, uninterested, time wasters and feel-good chasers.

Any suggestions are highly appreciated.