Avoided Temple for the whole season, now wanted to give it a go to learn the basics and get a taste of what the divine drop craze was about. Where do I start?

...next season

You start next season

Your architect is actually in the perfect spot for the basic Milky temple setup.

https://sulozor.github.io/#/atziri-temple

You can see the basic Milky temple here, just follow that if you have no knowledge about building temples.

There are plenty of guides and videos readily available. There are also similar questions asked in this sub if you just used the search function.

Search LLYD in youtube, he has 2 parts on step by step temple. Also Farham to gigajuice It step by step

https://youtu.be/H_r1w4lKCxg