Simple Chat Apps in Hybrid

I want to build a simple chat apps My budget is 700$ I need a hybrid apps built in Flutter or React Native I don't have a developer and designer background so i need ui and apps Quick brief 1. User register using phone number (like whatsapp) 2. User has whiteboard that user can do freedrawing, input text, upload pict, upload video max 15 second (like instagram) 3. User can use it as message and send it to other user (like instagram) 4. Pop up will appears in other user phone(like phone call) 5. Other user can reply it 6. User has their list of inbox and sendbox 7. Chat or drawing will remove after 1 hour for inbox and 15 minutes for sendbox 8. User guide appear for first time user 9. Notification for message 10. I need admin panel Flow admin panel 1. Login 2. List of user Flow user 1. Sign in/sign up 2. Inbox Whiteboard Like tiktok Chat or drawing will remove after 1 hour for inbox Swipe up or down to see other message So don't need to grouping by user, but just ordering by receive time Swipe right to see sendbox 3. Sendbox Whiteboard Like tiktok Chat or drawing will remove after 15 minutes for sendbox Swipe up or down to see other message 4. Create drawing 5. Send drawing Flow other user 1. Pop up will appears in other user phone(like phone call) 2. Option to open it or close it 3. If open, drawing will appear 4. Option to reply 5. Swipe up to see other message 6. Swipe right to see his sendbox 7. Back to close app