Hey bro, great question as you should get involved in this as the skies the limit for it as we're still in the infancy stages of the business.
There's definitely going to be some expenses in the beginning. If you have a powerful machine (PC) with a really fast GPU then you can use the offline tools which are the best to use because they're free and generate better images for your model. I use Fooocus which I highly recommend to generate your images, but you can also use the most popular one Stable Diffusion or Comfy UI. Then for deepfaking videos you can use something like Rope-main from Hillobar. There's another one called Roop as well that people use, but Rope-main is the one that I use to deepfake my videos, and it has it's own face swap for images as well.
Now, if you don't have a powerful machine, or money to build one, then use the online tools which will run you up some money because it's on a subscription basis. I started out with these even though my machine was powerful enough. SeaArt AI (best face swap online option), Leonardo AI, Civitai (nude images), AnyDream, and MidJourney are the best online options.
With video making you may need ElevenLabs for voice changing AI, and that site is super expensive.
There's also other things that you might run into to pay for like on the side I'm making my own AI generated music for my videos and Instagram reels, and I use Suno for that as they have a subscription to use their service.
The other expenses will be if you decide to get paid help out there. Like I'm planning on Sexy Dixy to promote my membership sites like Patreon, and my own site that I'm currently building.
There's definitely some money that you will need, but it should workout at the end of the day.