Welcome aboard taahir,
Start with your Maya help files. They include some basic tutorials and basic information to help you get a little familiar with Maya. Then visit the tutorial section of Simply Maya. They have good tutorials on modeling, texturing, etc. Post your works in progress in the WIP section and you can get some pretty good feedback to help you improve.
Since you have experience with Photoshop, you should do well with texturing. Can't wait to see what all you learn to do with Maya. Best wishes.
Don't be satisfied with what you can do but rather strive to do the things you can't do!