Well congratulations you! Welcome to RAW feeding!
The only time I take the fat off is when I have a dog who needs to loose some weight or when there seems to be an excessive amount on the rmb. They do need some fat.
Yes veal breast is fine to feed.
Its up to you really, I do feed live yogurt a couple of times a week because they enjoy it and it is full of good bacteria. I don't generally feed cottage cheese but you can. I give pureed fruit and veg sometimes, once a week usually. None of these things are necessary but won't do them any harm and are good for them in moderation.
You don't need to stick to one meat a day if you don't want to. Sometimes I have a day when they eat only one meat. Other days they eat 2 or 3 different ones.