Welcome to the community! Thank you for sharing about your use case. To implement a DHIS2 system there are a lot of steps to take and things to consider.
While the community is here for you every step of the way, it will be very important to take a learning path to learn more about how the system and configurations work. Please have a look at the interactive in Learning Paths - DHIS2 to get a better idea.
Have you checked out any demo or heard about a DHIS2 EMIS implementation? I’m curious to hear what interests you the most in starting this using DHIS2?
Additionally, there are many before you who asked similar questions, so I believe I will quote them here: @Knut_Staring :