Apps Need tip for a instruction app

[cele]

Hello,
could me someone direct to the right way to start/make a app!

I would like to make a APP for android that would interactively help a technician step-by-step how to do for example firmware update.
There are 100 hundert different models and such an app could help beginners.

Example

steps:
1. get a firmware (when done go to step: 3)
2. go to www and download xy
3. connect to router (when done go to step: 5)
4. start terminal emulator and set xy
5. login in
6.....

tnx

 

[ocnbrze]

start with android studio:
https://developer.android.com/studio/intro