how to make a tile map?

[WAKS]

Hello!

I'm making a 2D rpg game. Right now am I using one large background image that I move around the screen. Since it's one large background image, it use a lot of memory. Therefore I want to make a tile map instead, the problem is that I dont know how to make one. I have tried many tutorials, but I find them a bit confusing. If someone could tell me how to create a tile map or know about some really good tutorials, that would be nice.

Btw I'm using SDL