Your triceps must be fried working it 3 days in a row.
When you are a beginner, use a program that actually works. Don't reinvent the wheel. And that is just one of many. Just pick on, do it to the letter and be consistent. After 6 months, we can reevaluate.
As for your diet, considering your height and weight, you are either one big muscular dude (Lou Ferrigno was 275 at 6"4') or just plain fat. I would have to say it's the second. Being honest on where you are is the first step. "You don't know where to go, if you don't know where you are"
Glad to hear your diet is cleaning up, but I would suggest you write down everything you eat for one week and put it in a calorie counter. Most Beginner have no idea how "wrong" they are when it comes to nutrition.
I know your next question will be "How much should I eat". Refrain from asking, until you know where you are. You can post a typical day here and we can help after that.
As you have been training "seriously" for two weeks, don't worry about numbers. Just follow a program, write it down and you will see progress. This game is measured in months, and years, not days and week.