I've got a 4yo. We worked out a system with a mediator (Belgium, similar rule here) that comes down to "I bring the kid to school on Monday, he picks him up, I pick kid up on Wednesday around lunch (no school in the afternoon), he picks up kid on Friday after school and has him all weekend, he brings kid to school on Monday" and then we switch. This way, we both don't have to do without the kid for longer than 3 days, and for the kid it's very clear when the switches are (Wed/Fri), and we both have entire weekends with/without the kid.

Even though you've agreed on week/week, your reason behind this is work and practicability - this does not put the best interest of your children first. It's not good for children that young to be without one of their parents for an entire week. Certainly for the 3yo, they've got no concept of days/week/time yet. We plan to start a week/week thing when the kid starts elementary school at age 7.

My ex and me are pretty friendly (it was mutual agreement) and we both found places to live in the same village, no disagreements about the school and money and whatnot, so that's all great. Even then, it took the both of us a while to get used to being "single". Which is normal, I think. One of the perks of divorcing when the kids are young though, is that now, my kid no longer even remembers us being together and this has become his "normal". I think that helps. I have a new relationship now and that was difficult for my ex to accept for a while, but it's okay now. We're all civil.

And with dating, ehh, give yourself some time. I found Tinder to be pretty fun after being in a long relationship for a long time. It's nice to see what's out there.