I'm 6ft4 also and started out at a similar weight to you, I was around the 330lb mark, and I’m now down to around 230lb.
I can't give you a sure fire way to lose weight but I can tell you what has worked for me.
I started by solely working out my diet, without a healthy balanced diet in place there is little chance of making much progress. You seem to have understood what you need in terms of diet with lean meats, plenty of vegetables and good healthy fats, one thing you really need to be careful of is any dressings or sauces you use on your meals, a 500 calorie meal with plenty of healthy greens and lean meats can quickly become a 1000 calorie meal if you use a full fat mayonnaise and other additions. Also as a generalisation vegetables are superior to fruit in terms of vitamins and minerals and also have fewer calories due to sugar content.
I personally don’t snack at all so have very little information to give you in that regard, but if you do choose to snack steer clear of anything processed, again as a generalisation “if it doesn't grow don't eat it”.
Exercising at 300lbs+ is quite simple, as it doesn’t take much too really get your heart pumping and get you out of breath, avoid running though as your joints will hate you for it and it can cause injuries which may set you back if they knock your confidence. I started out by doing challenging walks across Guernsey’s coastline, so plenty of ups and downs and uneven surfaces to keep your body working. I then moved on to cycling as it’s a zero impact exercise so your weight won’t cause any problems due to jarring in your joints. The saddle can be a little uncomfortable to start with though! I now cycle to work daily regardless of the weather conditions, if a little rain or wind stops me what mental state would I be in if something serious actually came along, such as an injury? The smallest changes can make a difference, just taking the stairs rather than the elevator is a small change which will benefit you.
If you’re not a breakfast person don’t worry, you don’t need to have breakfast to lose weight regardless of what you’re told. The only time I have a proper solid breakfast, a 40g bowl of all bran, is on the weekends prior to a 20+ mile cycle ride.
You also need to be mindful of the fact that you’ve got a lot of weight to lose so there is not going to be a quick fix, it’s going to take time to lose weight so you have to make sure what you’re doing is sustainable for the duration, it’s no good going on a 1200 calorie a day diet but only keeping it up for 2 months before going back to your old ways. Make sure you’re eating enough and do have a cheat day every now and then to keep your sprits up, I have one every week, normally on a Friday or Saturday. On these cheat days I either have something really unhealthy, like a pizza and fries as an evening meal, or I have a huge portion of something which isn’t too to bad, such as chicken fajitas (5 tortillas stuffed with chicken breast, peppers, onions, jalapeños and salsa, I steer clear of the cheese and sour cream though).
Best of luck with your journey, if you’ve got any specific questions feel free to ask!