Resources you should buy:
Sketchy Medical
Boards and Beyond
Pathoma
Resources you should download:
Zanki (Anki deck)
Pepper deck (for sketchy)
Start Zanki now, try to complete it before the end of summer before you start M2. Do 50-75 cards a day and keep up with the reviews. This will put you into an excellent spot to crush step 1. Then, fall semester of M2 you can start doing Q bank questions (start with RX, then move on to Kaplan). Finish Kaplan by winter break and you can then start UWorld in January. Do 2 passes of UWorld during January through your dedicated. Apart from Zanki, I highly, highly, highly, recommend starting sketchy micro/pharm right now. This is something that I wish I knew starting M1. The most important subject in M1/medschool is Microbiology. Micro unlocks pharm. Know your micro cold and you will see the benefits in all of your other classes. Pathology becomes much easier, pharm becomes infinitely easier.
The basic strategy for Zanki is, watch Boards and Beyond and then do the corresponding Zanki cards. Be consistent with this and you will start seeing the rewards. Start with decks that you will be doing in M1, like Biochem, physio, neuro, micro, etc. Go hard during winter semester and your breaks to complete the rest.
I did this during M1 and I'm so glad I did. I am just finishing up Zanki right now and have started doing Q bank questions. I took a baseline NBME and I'm at 232. This is without ANY UWorld. This is purely Zanki, Sketchy, Pathoma and a decent amount of USMLErx. I still have a year until I take Step 1 and all I have to do now is keep up with my reviews and do Q bank questions. It has made M2 a lot less stressful because I put in the time early.
If you have specific questions, just PM me. But yeah don't listen to the people telling you just to chill and wing it when you get there. Start doing stuff now and it will pay off later.