You may find using sprites is the easiest (check out the 'Sprite' commands in the Blitz3D help - hit F2 or F1 twice in the default IDE, I think!). Sprites are flat 3D entities and are square in shape, but your texture can always contain transparent areas to create the look of more complex objects - depends what you need. They are easy to use and can be set (default) to always face the camera (you always need a camera and lights to view 3D objects).
However, creating your own quads is more flexible and faster (but more complicated). Check out this code I found by quickly looking in the code archives. I am not saying these are the best for you, but they look ok from a quick read through and you should be able to modify for your own needs. If all you need is a square, you only need 4 vertices and 2 triangles (a quad).
http://www.blitzbasic.com/codearcs/codearcs.php?code=463
http://www.blitzbasic.com/codearcs/codearcs.php?code=382
I learnt an awful lot by studying other peoples code, so always worth browsing the archives (and forums). 3D is a big topic, I am still learning after having Blitz3D for nearly 2 years!
Have fun,
Rhy
EDIT: Oh, and once you have your quad or sprite, you will apply your texture to it using EntityTexture. You will need to store handle of the quad or sprite in a variable which you pass to EntityTexture (see Blitz help). You can adjust texture position using UV coordinates (do a search, I am sure you find exisiting info on this).
However, creating your own quads is more flexible and faster (but more complicated). Check out this code I found by quickly looking in the code archives. I am not saying these are the best for you, but they look ok from a quick read through and you should be able to modify for your own needs. If all you need is a square, you only need 4 vertices and 2 triangles (a quad).
http://www.blitzbasic.com/codearcs/codearcs.php?code=463
http://www.blitzbasic.com/codearcs/codearcs.php?code=382
I learnt an awful lot by studying other peoples code, so always worth browsing the archives (and forums). 3D is a big topic, I am still learning after having Blitz3D for nearly 2 years!
Have fun,
Rhy
EDIT: Oh, and once you have your quad or sprite, you will apply your texture to it using EntityTexture. You will need to store handle of the quad or sprite in a variable which you pass to EntityTexture (see Blitz help). You can adjust texture position using UV coordinates (do a search, I am sure you find exisiting info on this).