First of all, the project we were filming, was based upon a supposedly haunted location, here in Georgia. The Rufus M Rose house. If you want to know more about it, check out my company's website (where within the week you should find the movie), as well as my ghost blog. They are listed below in my signature / resource box.
Okay, the first step is a fundamental one. You must have content. Like anything else, the quality of your content will decide how popular it is. The theme of your movie needs to be appealing, and you must be able to convey it well. If you can not do that, there is no point for me to go beyond that well. So make sure your concept is stated.
Nextly, realize this is an outline I used for making our movie. It is by no means an official process, and is probably far from what educational institutions teach today. My recommendation is that you use this to see how so-called "Guerilla Film-Making" might go, especially if your turned in a program somewhere.
Alright, once you have your concept defined, and you've done your research, then you go into pre-production. The Pre-Production phase usually consist of writing or refining a script, allocation of the movie budget, and casting. If you are producing your movie, then you are probably the director, and maybe even the writer. So you should not have to worry about that.
With your budget though, you need to be very careful. Even a low-cost film meal for YouTube will still require a budget, even if it's less than $ 100. You would be surprised what items will pop up as expenses, even if the movie is made "on the cheap". Things like transportation, film / editing fees, equipment fees, there are tons of potential pitfalls, so you should prepare yourself for this. If you have enough people on your team, you should have someone in charge of the budget itself.
After that, you must handle casting. Identify the parts you need. Get a person in charge of casting. Give plenty of time for actors to hear about the auditions, then hold them. Fit to budget. Do this as many times as you need to make it work.
After you've done all this, you move into production. Which literally consist of shooting, and all events to make sure that shooting goes well. Hopefully, you will not have too much shooting to worry about, or complementary elements to the shoot. Hopefully all of your players show up on time.
For every scene, you need a unit director. A person in charge of that particular scene, if not the director himself. He needs to keep everyone moving, and he needs to help the Actors into their roles. Have the casting manager on hand. Lastly, any people you have working BTS (behind the scenes) make sure they are all on the same page. If you have a lot of crew, you may need a crew manager.
The last step is post production. All shooting is done, and you just need to turn the raw footage into a film. Your director needs to still be very active at this stage, as do your writers. If you have to reshoot something, or add audio, it is done here. After your done with post production, the film is ready, now all you need to do is put it online, and promote it, which is another can of worms in itself!