Garden plan!

My brain is melting!  I’ve been working on my garden plan for 2017.What do I want to grow?  When do they go in? (Work backwards from last spring frost date- a wild guess semi-informed by the average of the last 7 years)  When do they need to be started inside?  How much to I hope to produce, therefore, how many plants?  How many starts should I attempt to be sure to get enough, and how many square feet do I need to allocate?   Gah!  I’m not even at examining crop rotation and where they will be placed this year yet.  I don’t have a clean system for that yet.After a page full of tiny digits, math, and an eraser, I’m sure this is the sort of thing I should definitely do a spreadsheet for.  Then all the dates will adjust to an input frost date, and the square feet will output from a desired quantity.  But it just feels wrong to do it with a spreadsheet, and I don’t need to spend any more time staring at a screen.This is the right time to be doing a garden plan, since the first seeds need to start inside on Feb 2, apparently, and I know for sure that if I don’t do this possibly too-meticulous planning, that half my starts will be ready to go out too early, the other half not early enough, and I’ll get not enough potatoes and far too many spaghetti squash.  What is up with spaghetti squash?  They grow like zucchinis! If I do do this detailed planning, then climate change will sweep through to put me 2-4 weeks off; slugs, rabbits, and other emergencies will happen and it will be all thrown awry anyway, but, it won’t be my fault:)