Creating tiles is done in an image editor. The tiles are simply 2D images (or rather sections of a 2D image.) You can use one of the common image editors (Photoshop, Paintshop Pro, GIMP, etc.) or a more special purpose tool like Pro Motion.
Other than the actual tiles you will need a map editor. I couldn't tell from your message if you will need this too but if so check out Tile Studio or Mappy. Both are excellent 2D map editors and both have code for use in Blitz.
Other than the actual tiles you will need a map editor. I couldn't tell from your message if you will need this too but if so check out Tile Studio or Mappy. Both are excellent 2D map editors and both have code for use in Blitz.