Alright guys, here's the thing. When you start your first class, most of you are probably going to be overwhelmed and feel like this is impossible. You're going to wonder what the hell you got into. No amount of preparation will be adequate, and you will all start scrambling to figure out how to study appropriately. Believe me, 99% of you will experience this exact same thing and anyone who acts like they've got it all figured out is probably lying.
That aside: you will need to learn what works for YOU. We can give you advice, but at the end of the day, what works for me might not work for you. The first semester of M1 is a grind because of this...you just feel like you have no idea how to study and it's a bit overwhelming, I'm not going to lie. BUT, you will figure it out, I promise. So, all that being said, here is my advice for M1. Do not worry about M2 from now.
Do not attend lecture. Seriously, it's a waste of time. I attended every lecture in undergrad, but it's just not efficient in med school. Watch them on 2x speed, highlight important things or something that the professor seems to emphasize. You will learn what to do for which professor-- for example, Dr. Zaidi, who will teach your first class, makes it very clear what she expects you to know by highlighting it in red on her powerpoint slides. Others, not so much. You will be told this by your tutors. For first year, most of the courses are taught by PhDs, who will test you on random minutiae. It sucks but it's what it is and how it works at most schools, luckily for us M2 is entirely taught by MDs/DOs. So, because of that, Zanki/AnkiKing/whatever alone likely isn't enough to do well. Maybe enough to just pass, but I'm not sure I would take that gamble. However, I think making your own cards is a waste of time with one exception: anatomy practicals. I tried making my own cards for lecture and found it was just taking a ton of my time without improving my grades at all. But, I did take the images from our anatomy atlas and make cloze deletions cards on Anki with them (basically where you block out the label of the structure and then answer it and it becomes uncovered). Would definitely recommend doing this. For lecture, use your pre-made deck. Divide # of cards by # of days until a few days before the test, do x amount of cards per day. If you feel like you are having trouble understanding some things in the lecture, you have several options: 1) consult a textbook, like BRS physio or something like that, 2) make your own outline of the lecture. The key is just repetition, so you want to make sure you've looked at the material a few times before the exam. Re-review things every 2-3 days, just keep packing it in.
Now, on the topic of boards. Do not think about them at least until after your first couple of courses. Seriously, it's enough as is. As Schwifty mentioned, if you want to have all of Zanki/AnkiKing/whatever completed by dedicated time, you should start in M1. I started around October of M1 and today have all of Zanki, Lolnotacop (micro deck), and a pharmacololgy deck completed (~31,000 cards). I've been slaying q-banks and overall this will make my dedicated study time a lot less stressful and overwhelming than for people who haven't reviewed anything since they learned it the first time. HOWEVER, this is not something to take lightly and is not an easy feat. I'm not trying to toot my own horn or whatever, but this takes serious commitment. It means doing your cards (news and ALL REVIEWS) every single day, no matter what. It means that when I went on vacation this winter break, I did 3 hours of cards in front of the pool every day. It's not for everyone, but if it's something you really want to do, I agree that you should start M1.
You guys will be fine. It'll be a huge adjustment, but the last 2 years have flown by for me and I am amazed at how much I have learned. It's a pretty great feeling and I wouldn't want to be doing anything else, despite how hard it gets at times. You got this!