Hello everyone and thank you all for taking the time to read my post.
as the title says, i’ve been working on a movie (a trilogy to be more precise) who would be basically kind of like an epic peplum altering between scenes of dialogues between main characters/scene of exposition of different places of antiquity and scenes of battles. i’ve been working on the scenario for a whille now and i’ll be soon done with it and therefore could start creating the scenes, and i have a few questions for people who know AIs video creating better than i:
which one should i use? would you advise me to use only one or multiples different AIs? is there some specific things (like tutorial or informations related to the use thoses AIs) that i should learn before starting to create the scenes? should i buy some specific app or tech to be able to use them more efficiently?
i’m not bound by any budget (as long as the prices are reasonable) in case it changes your advices. and although i would rather finish the project sooner than later i’m ok with taking the time necessary to make a better end result for my project.
the same questions i asked can also be applied to creating music IAs in case thats something you know too.
sorry if my message sounds a bit weird english isnt my native language.
thank you for your time 
Hello! I don’t claim to be an expert but I will tell you what I wish someone told me when I started.
As for which video model should you use I would use the one where you get the most model generations for your money. There are many platforms like openart.ai and leonardo.ai that allow you to use many different video and image generation models. This makes it so you can test your prompt using different ones to see the strengths and weaknesses of each. There is also The Google Pro and Ultra plans. As of right now the Pro plan is $20/month and the ultra plan i $250/month. I forget how many credits the pro plan gives but the Ultra plan currently allows you to have unlimited Veo3.1 (fast - low priority) generations. This is what I use and I also have a yearly subscription with openart.ai. So Veo3.1 is what I use for most of mu generations but when Veo isn’t good at something like special effects or something else I will see what wan, Hailuo or Kling can do in openart.
Past that I have found that if you are going to use an image as your starting frame it is good to upscale the image before starting the clip with it. You can upscale in openart or you can get a subscription with topaz, magnific or other upscalers.
After that you will load your clips into Adobe premiere pro or Davinci Resolve or Capcut, etc. This is where you string the clips together to make the film and you add music. You can get music and sound effects from Pixabay. Pixabay is really great but you will have to search through what they have to get the right sound or music.
Hope this helps