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For many popular roguelike games different tilesets are common. Search for "dwarf fortress tileset".

I'd recommend installing the Lazy Newb Pack instead. It has all the tools and tileset you need preconfigured:

Now that's what I needed to try this game. Last time I tried, I spent hours and hours downloading tools and never ever got to play the actual game!

Also read some introductions. Some tips like "no aquifer" for your first settlement really ease it.