There isn't a "wrong" way to do comics, imo. You just do whatever works for you.
What I recommend doing is that you at least have a general outline of where your story goes and put it on a doc, and then draw a buffer, especially since your comic is updated weekly. It's less stressful and you get more time to yourself if you have a backlog of episodes (don't be like me, I lost my buffer because I fucked my computer up, and I ended up starting my comic anyway, and now my most recent episode is 4 days late, lmao.)
How big your buffer will be depends on you and how busy you are, though- the usual number I hear is about 7 pages/episodes, but if you're really busy I recommend something a bit more than that, maybe 10.