There is a spectrum for how one approaches doing a camino.  At one end is the detailed planner, the Type A.  Type A works like this.

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Start with a spreadsheet. Work out the stages and the stops for each night.  Identify any particular sights that you might want to see on or near the camino.  Check the elevation profiles for hard days.  Read carefully how much asphalt walking there is versus track walking.  Get the days nicely balanced, making sure that before any big sights you have a short day so you get an afternoon and evening to enjoy the place. Get going on Booking.com or contact hostels directly to book rooms.  Make sure that every few days you are staying in a place with a washing machine.

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Set up second spreadsheet to cover the kit. Every item needs to justify itself in the rucksack. Every item of clothing needs to be right for the season. Then every item needs to be weighed on the kitchen scales to make sure the total (skin-out weight minus lightest wearing outfit) is not too heavy.  

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Then train - fill up rucksack and do a couple of 25Km days to check out the weight and identify any problems with kit. Start thinking about the wine choices for your evening meal on Day 6 as you've already chosen the restaurant for that night.

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Type B is a little different. Type B says "the camino will provide" and "follow your heart".  Type B turns up at the start point hopelessly unprepared and with a rucksack of strange things (my favourite ever was the Belorussian girl who had brought no boots on the Frances but had packed a board game) but somehow still gets the pilgrimage done. But the care-free casualness gets a bit mixed up with the stress about where to sleep. 

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Most people are somewhere along this spectrum.  

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Of course if you are an extreme Type B, the real trick is to buddy-up with an extreme Type A to do all the hard work for you...