There are a lot of models. LOTS. There is no perfect way to do anything, and anyone who tells you "don't do this" or "always do that" generally has a very narrow amount of experience.
When dealing with very little cash, the things to try are:
1. Find a True Believer. These are the best. People you can bring on board as a team member who believe in your company, your mission, and your future are the absolute best you can get. While you may not want to think about things like equity or deferred salary, that's basically what all core team members are doing, and these people do anything and everything they can, including using contacts they have, working overtime, etc.
2. Barter. Someone has some skill or group of skills that a marketer wants. For example, I've got a great branding and marketing guy. He has lots of clients. Some of them are going through corporate or business issues that require an advisor with significant legal and/or business background, both of which I happen to have. I advise the companies, and get their goodwill and his expertise. See how this works? Figure out what you have, and how you can make it work. I've got deals for lots of different things, and keep that all-important out-bound cashflow to a low trickle, while building my network and goodwill in quick fashion. (Yes, it increases your workload. But who said starting a company was easy?)
3. Work out a shared deal with other start-ups. You probably don't need someone full-time, and you need the exact same services as other people in the same stage. Form a mini economy of scale, and batch-buy some hours from someone, which also maximizes the marketer's odds that one of you will make it past start-up and actually become a full-time work project.
4. Figure out how to do some marketing yourself. It doesn't take much. There are a bunch of books on how to create your own buzz/ PR/ marketing. Start building it yourself until you have enough cash flow to pay a retainer.
5. Consider a small salary from a portion of directly generated gross margin, plus a vesting amount of equity that begins to trigger on reaching a certain amount of salary, further milestoned.
There are other ways, but those are off the top of my head. If you need it, you can make it work. Just make sure you need it, not just want it, so you don't make a deal you don't want but are stuck with.
You may also want a probationary period.