Start with ComfyUI
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At first glance it may seem complicated, but if you approach it properly step by step, over time it will turn out to be very simple and intuitive.
For getting started, the default workflows that are already included are enough. Later, when you understand how it works, you will create your own or use others found on the internet. A good source is the ComfyUI and StableDiffusion subreddits. As for models, I can recommend for images Z-Image-Turbo, Chroma, Flux 2 Dev, Qwen, Illustrious/NoobAI, Lumina. For videos Wan 2.2 is the top one imo.
If you want something simpler than ComfyUI for videos, then I recommend Wan2GP
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Fewer possibilities, but easier to use.
If you want to learn more, I recommend joining Discord servers related to this topic
NSFW AI -
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The AI Bunker -
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