App changes

i have purchased a ready made taxi app script and i now need to make additional changes to it. i want to make it into a multi category service offering rides and courier. how will it work: 1. users will select service category , if they select rides then the flow will work how it is. 2. if they select courier service category, they will then need to select or create a request and then the flow will work how it is. 3. to select or create a request there are 11 screens to be added. service types request list view request details add request add request details add pickup details add drop off details how it works how to add request x 3 4. i have made the 3 website module in a separate admin and database which will be added into the main script. Api is also needed to be created. 5. links will be added to other screen on what the user has requested. 6. need to add the screens in to the user ios and andriod app 7. need to show data in website on what service category the user has selected.