The AI, image, and audio models that can run on a typical PC have all been broken down from originally larger models. How this is done affects what the models can do and the quality, but the open source community has come a long way in making impressive stuff. First question is more hardware - do you have an Nvidia GPU that can support these types of generations? They can be done through CPU alone, but it's painfully much slower.
If so, then I would highly recommend looking into Ollama for running AI models (using WSL if you're using Windows) and ComfyUI for graphical generation. Don't let the workflow of complicated ComfyUI scare you, starting from the basics with plenty of Youtube help out there it will make sense. As for TTS, there's a lot of constant "new stuff" out there, but for actual local processing in "real time" (still takes a bit) I have yet to find anything to replace my Coqui TTS copy with Jenny as the model voice. It may take some digging and work to get that together, it's older and not supported anymore.