I believe all independent "creative" project work suffers the same business/financial limitations.
1. The ratio of clients to advertising dollars will be too low to justify advertising/marketing your way to a profitable business. This is why so many buy a lot of equipment and advertising and soon you see their stuff for sale on Ebay.
2. All businesses succeed in either two ways. "Right place and right time" (like you got into music videos when MTV started, or slow-mo video when it became hot, etc). Or two, you are persistent and focused for a enough years to establish yourself. Word of mouth is what gets you clients and it takes time, always more than you expect/want....need ;)
3. You need enough skill to be competent, but after that, too much effort in the art, versus, marketing, it detrimental financially.
4. Ultimately, you're going to need a large client that pays your nut. It might be a Church at a corporate level, or a local utility company, etc. Or maybe a powerful wedding planner, etc. As they say, you'll put in the same time for a $20,000 client as you will a $2,000.
To really answer your question, there is no one way corporations or any potential client does things. I don't work in video, but in a similar way. What it took me years to see is that I can't "structure" my services to what I think clients rationally want. Often, if I can do 10 things, and I think item 10 is the hardest, most accomplished, and 1 is the easiest which anyone can do, often the client values 1 the most and 10 the least. You have to let the client pay you for what they value. If the client wants to pay you $10,000 to do 1 and you bill $1,000, hoping they'll do 10 one day, you'll learn the hard way as I did. Charge what the client will pay for what the client wants. Do NOT negotiate their end of the deal. After you determine what you need to charge to stay in business charge that at minimum. Naturally, you'll take jobs where you're paid 1/10th of what you're worth, because you love it. That means you have to let clients pay you 10x what you're worth sometimes to do something that you know a simpleton could do--again, listen to what the clients wants, not what you think they need.
Ultimately, your job is to free up the client's time to focus on something else. Yes, you need to do a good job, but you have to keep in mind you're always a part of a larger goal.
Well, dog has to be walked so I'll write more later if this thread goes anywhere. Set aside 5 years to build a video business, keep an open mind as to how that my evolve, who your clients may become, what you may end up specializing in, and you'll get there.
Just keep in mind you'll make less money than in a corporation. So you have to really value your independence.