Shams,
I would start with this article.
ArcGIS Utility Network and ArcGIS Field Maps (esri.com)
From there it has links at the bottom to some of the other pages and information you need to fill in the answers to the questions you have.
biggest thing is to read and learn about all your options, so you build a sustainable workflow for your team. Any time spent by you and your team learning will be paid back 100 times over by an efficient and enabled field workforce.
Best to you and happy learning and planning.
Richard Koch