Hello, ImAllLike...
Naturally we're all in a hurry when we finally make the decision to tackle those extra pounds. Nothing wrong with that. Lots of people who aren't fussy about variety seem very happy with meat and eggs and cheese, not much else. Just be sure you eat the FAT that comes with the beef and pork. Bacon is a good idea. I like BBQ myself (Smoked only--HOLD THE STICKY SAUCE!)
On this plan, you can expect to lose 1-2 lbs. a week. That's excellent even if it seems "slow." By now you should be eating just enough to feel satisfied, and your hunger signals should be down to nothing. That's a big benefit of low-carb.
As for the diet soda, YMMV. For some it's an indispensable aid to sticking with it. For others it can have a metabolic effect (sugar cravings) that makes things tougher. If you think something is "slowing you down," try cutting out the soda and see what happens.
Don't worry about the exercise part for now. Losing the extra fat is all about diet. However, as your fat decreases and your energy increases, you may find that being more active comes naturally to you. "Exercise" doesn't just mean working out in a gym or pounding the pavement. Sports, outdoor activities (in our case, shoveling snow), climbing the stairs when you can, etc. Any kind of movement adds up.
Best wishes.
P. S. While you're here, look up the Journal of Ken Khrussva. He has dropped a mountain of fat. It took him a couple of years, but his choices and his commitment are the keys to success. Or find his story here:
https://www.dietdoctor.com/way-eating-saved