release purchase orders through a mobile application mdk.

Greetings community, currently I have been assigned the task of developing an application with the mobile development kit that allows creating, modifying and releasing purchase orders, it should be noted that I have little experience but with a great desire to do things great in the sap platform, it would be of great help if someone has done something similar, or suddenly has some indication of how to carry out this development, thank you very much in advance.