You can measure yourself, shoulderblade to shoulderblade, or hand to hand if you were to hold both hands out comfortably like you where shaking hands (elbows bent at least slightly). That will give you an idea what bar width you will need (400, 420, etc.). Don't be surprised if you actually need a 380 or even 360mm ideally. After getting the initial measurement some of it is personal comfort (some people prefer a size wider than their actual measurement, and that's ok).

Your brake levers will fit. All bars fit any standard brifter as far as I know. You will want to check your stem vs. the bar width at the stem as there are two sizes. Oversized (31.8mm, I believe) and standard. You'll either need to get bars to match your stem or plan on changing the stem as well.

75mm is likely the reach (measurement from back of the bars to where it starts curving downward (where your brifters will fit). There's also a drop measurement; this *may* be the 85 number, but I'm not sure. If it is the 85 then they are very shallow drop (my drops are 142mm), which is becoming the popular choice. Both of these are more or less irrelevant if you've tried the bars and like them, but you can compare them to the numbers on your current bars (they may be marked up by where the stem connects, you may also find the necessary stem measurement here as well).

Anatomic is a type of drop. There's a standard "old school" round drop, an anatomic drop (I believe this means it's flat or flatish in the forward most section), and ergo drops (have "bumps" that are supposed to be contoured for your hands).