While not having watched the video you are talking about, I feel I am fairly up to speed with the way Phil trades, so I will attempt to answer your question :-
1) A pullback is a bar preceded and succeeded by lower bar highs for long trades and higher bar lows for short entries. So it's a 3 bar combination. The 3rd bar being the corrective bar.
Once the pull back has been identified, then your entry goes above the high of the pullback bar for longs, and below the low for a short trade. Your stop would go at the lowest/highest point of the retracement prior to the trade triggering.
2) You would use fibs to look for a new entry or a re-entry on a trade. In the image below, if you were looking for long trades, you would take the fibs from the low to the high. Wait for price to come back down to a fib level you are interested in, then drop down to your lowest time frame to look for a bias change entry.
3) The purpose of using different time frames is identify new trades, and then identify the entries depending on how aggressive you want to be. The more conservative you are, the higher the time frame I suppose.
Hopefully this answers your questions.