Developing an ai assistant

I wanna develop an ai assistant that is highly scalable meaning everytime i need to build a model i just retrain my ai assistant on a new data. it can genertate text and content , it has a feedback loop and i can mentor its correctness in real time and it can learn by itself . the output is optimized in a well structured format . can you give me a roadmap with every technologie that can be used and mention if it is paid or not