There's no one right way to deadlift. And there's no one variation of the deadlift that everyone has to do. Leverages, ability level, injury history, and preference will determine what's best for you. But for the conventional deadlift, these "golden rules" work for most people:
First, make sure your armpits are right above the bar. Many people set up with their armpits too far forward. This causes your body weight to tip forward into your toes which puts strain on the back. To get the weight back, make sure your armpits are above the bar.
Next find the maximum tension in the hamstrings. Play around with your hip position. Make sure that they aren't too low or too far forward.
To complete the rep, pull the bar into you like you're shaving your legs.
Burn your foam roller and give the tennis ball to the dog. You're going to learn how to fix sticky muscles and bust up adhesions using nothing but your hands.
"Every day, I hear someone say, 'I'm too fat. I need to lose 25 pounds, but I can't. I never seem to improve.' I'd hate myself if I had that kind of attitude, if I were that weak. I can lose 10-40 pounds rapidly, easily, painlessly, by simply setting my mind to it. By observing the principles of strict discipline that bodybuilding taught me, I can prepare myself for anything."
A conventional barbell is fine, but if that's all you use you're missing out on strength gains and a little novelty. Change your bar to improve your training.