Q: How do I add the tiles?
A: You can COPY them from your tilesets and PASTE them in the map.
Q: Do I need to overlay the picture in order for the character to walk under?
A: If there is a part of your map where you need to walk under then YES! – If not then don’t bother
Q: Can I use any tileset?
A: As long as you think it’s suitable.
Finally, some people may think that I have stolen this tutorial however it is mine. I am under a different alias on this site than I was on this one. Please comment, if any queries arise, I will try my best to answer them.