rework my routine

whats going on my friends. i have a question/favor to ask of any and all of you who can give me a hand. last year, i had attended the arnold and had witnessed some of the most amazing lifting i have ever been exposed too. it was at that time that i wanted to convert from regular lifting to powerlifting. my problem remains that i am having a hard time figuring out where to begin. let me give you an example of my current workout routine:

Monday - Shoulders & Bis
Smith Machine Military Press 5x10,8,6,4,2
Dumbell Side Lateral 3x10-6
Small Straight bar Front Raise 3x10-6
Cable Rear Delts (overhead) 3x12-10
Barbell Shrug 3 or 4x10-6
Cambered Bar Curl 5x12-6
Standing Alt. Dumbell Curl 3x10-6
Dumbell Hammers 3x8-6

Tuesday - Legs
Squats 5x10,8,6,4,2 or 1
Leg Press 4x10-6
Rack Squats 3x10-6
Leg Exten 3x10
Stiff legged DL 3x8-6
Lying Leg Curl 3x10

Thursday - Chest & Tris
Bench Press 5x10,8,6,4,2
Incline Dumbell 4x10-6
Rack Presses 3x6-2
Machine Flye 3x10
Close Grip Bench 4x10-6
Overhead Dumbell Ext 3x8-6
Pushdowns 3x10-6

Friday - Back
Deadlifts 5x10,8,6,4,2
Barbell Bent Rows 3x8-6
Lat Pulldown 4x10-6
HS Seated Row 3x8-6

thats pretty much how i train now. i need help in converting over to more of a powerlifting style of training. i want to compete someday. i have the size and structure to be one of the greats someday, but i have to start lifting like a powerlifter if i truly want to be one. is there anybody who can help me rework my way of training? any help is far more than appreciated.