Project tracker with easiest learning curve Here's the thing. Most of my life it was all about Jira. Unfortunately right now I'm working as a agile coach (kinda) in an interactive agency that in terms of project management is still in Stone Age. I think that Jira might be a little bit too problematic in this situation, especially at this stage - early introduction to scrum. If you have similar experience and know best soft to use in this case (or maybe assure me that Jira can work), that would be really appreciated. Thanks in advance.

If your team is all in the same location, then start with a physical board. There is some pretty hard science out now that physical boards are better when you can take advantage of co-location. I recently wrote a blog going into more detail on why physical task boards still matter.

If you have to have an online tool, start with something dirt simple like Trello.com. New toy syndrome often has us jumping for all the bells and whistles. Instead follow the same principles of agile/ lean and go with the absolute minimum functionality to start. See what works and what you really need before going to the bells and whistles.