Adding voice and navigation to my iOS app

What my app has: - Using the Google Maps API to generate a map - With markers on the map in pink and black circles Needs: - Right now the upon launch it has a hardcoded longitude and latitude the map opens up with. I need it to open up with the current location instead - If I select marker a few things should happen: A pop up should come (the one on the left). If the user clicks the directions button(a line should be drawn with the route). Like a GPS or google maps when I get closer to making turns/etc the phone should say "make a left turn in 200m" Any API implementations are fine. Message me and I'll send the project.