find a wall plenty on the forums. type in cosmic prophet or kravenwolf or rolfy. these guys are legends and give out there made stuff. there must be an entity wall in there infact i know there is. so grab all their stuff find an entity wall mess till you get it right texture wise, then right click on object placed and all the settings appear, have fun there is lots of stuff to learn and keep it up dont give in it rewards you immensely in the end the possibilties are close to endless.
also things you should have
paint.net (free) for doing art and textures and changing art formats.
gimp (free) for doing normal, specular maps ( efx making light reflection etc. a must for later on when your ready.
blender, 3dsmax,3dcanvas pro,carrara etc. ( in the end if your serious about game development a model program is essential.)
good luck and hope you have fun
an unquenchable thirst for knowledge of game creation!!!