You can implement juddd the way you want. I believe 500/2000 in alternate days is the "Induction Phase" but I never did it, just went into 3 down days per week, never had any negative effects from giving it a miss.
I would say start off by doing 500/2000 with at least 3 down days a week, and don't even attempt two back to back downs until you are well settled on the plan. Once you get into it you can customise it to whatever way it suits you.
I did 7/8 weeks of the above, then started tweaking, my fasts are complete fasts, and they are from 5pm to 5pm, 3 times a week. Its what works for me. I don't count cals on my ups either. I've kinda got an idea of whats sensible from doing it for so long. HTH xx