Let us start off with just a few pointers about Android Studio and libGDX. Since Gradle is under active development, there are one important update to the libgdx-setup.jar that is compatible with the latest version (Gradle 1.11).
Another point is that libgdx generates bitmap fonts slightly differently than e.g. Andengine. There is a second tool that takes care of this issue called Hiero. There is a couple of good tutorials on how to use fonts with libgdx.
Finally, a classical tool for making tiled TMX maps is the Tiled Map Editor. We used this one to implement one of our first games called Soccer Kid – a retro Zelda inspired type adventure game where the player would kill monsters and explore by kicking around a football. Unfortunately the game had so many bugs (ehheemm…) that we had to take it off the market.