A brief, fairly unscientific explanation will do for this one. You cannot work the fat off any specific area of your body because, well, you cannot work fat. People mistake that good old muscle burn for something that magically removes adipose proximally from wherever it burns. Those were your oblique abdominals being worked, not the love handles next to them.
The rest period between sets is variable according to your goals. For strength rather than muscle size (hypertrophy), longer rests are required—preferably about two minutes or more. For hypertrophy and elements of muscle endurance, shorter rest usually works best—around 45-90 seconds. Considering that this program is designed for a combination of strength and muscle building, you will rest for one minute if possible. Longer rests between sets are sometimes problematic in busy gyms but a longer interval than one minute is fine if that's what you require to continue.
Various formulae exist for calculating what this starting weight should be, but I find it just as easy to trial different weights until you get to that limit. If you’re new to free weights, this helps familiarization as well. Try an obvious light weight, for you, to warm up and then upgrade to something heavier for the workout set. By the third set, you should have settled on the 12RM weight. If not, just move on and upgrade the weight next session.
There are some things on here that you can do from home if you own the equipment, such as I do, but there are some things you cannot do without going to a gym… because who really owns a Leg press in their home? That is why there are alternatives to almost ANY exercises such as using resistance bands instead of cables for the cable curls, etc. Tweak the program to best suit your needs!
For every person who lifts weights these days, it seems there are two who have a podcast about it. There are more bodybuilding tips promising greater strength and muscle than ever before, and along with them a ton of confusion; one buffed-up Instagrammer says lifting heavy will get you swole, while a well-known fitness personality has claimed in recent years that two 30-minute workouts per week netted him 34 pounds of muscle in a month.