AI-Powered Personalized Investment App Development

My project focuses on developing an AI-powered investment app that helps individuals invest in the stock market. The app provides personalized trading indicators, real-time price alerts, and portfolio management insights, using real-time data to enhance the investment experience. The goal is to guide beginners in investing. I want therefore to develop an application. I have few questions :
What are the key technical challenges in developing an AI-powered investment app that provides real-time trading insights?
How much will it cost to develop the application ?
How can we design the AI system to handle large volumes of real-time data and multiple users simultaneously?
What is the estimated cost of building the MVP (minimum viable product) for this AI-powered investment app?
What are the expected expenses for cloud services (AWS, Google Cloud, Azure) and data processing?
What ongoing costs should we anticipate for AI model retraining, app updates, and security maintenance?. Thank you in advance