I was wondering is there a minimum amount of courses i have to take during the summer, like i was wondering if i could just take 1 course during the first term and be done with it?

Also, i was debating between orgo and physics 1b03. I'm fine with both chem and physics, i just would really like to know which one is the bigger pain just to get it out of the way haha.

You can take up to 2 courses per term. So yes, you can take just 1 course in first term if you want. However, if you want to be eligible for OSAP (if you're receiving it), you need a full coarse load to get it, so you would need to take at least 2 courses in one term. So then you would need to pick up a second course for term 1.

I've taken both physics 1B03 and orgo, but I took physics during the year and orgo in the summer. I found orgo to be a pain because the labs were weekly and there was a lot of content jammed into 3 hour night classes, but people take it in the summer because it's supposed to be easier than spreading it out over the term.