Agree with JD's comments. I've only been going for about 8 years and live in the West Country so we always use the "West Channel" routes.
An "essential" is CC Europe volume 1 which will give you open all year sites and much other valuable information.
It all depends on what you want from a site - some have bars, pools, entertainment etc even in low season. These are not my thing, I'm not even a "coast" person but the inland sites can be very cold Jan/Feb/March.
Our route is Portsmouth/St Malo overnight, then down the west coast of France to Pons area, then St Jean de Luz, then Pamplona, Zaragoza, Valencia and then south.
Assuming you start from where we do, this is a much better straight line than via Barcelona and also avoids any problems and heavy traffic around that area. You will find OAY sites near Calatayud, Manzanera, Valencia.
The roads are very good and there are many less HGVs Saturdays and Sundays.
Last trip we had only two overnights between St Malo and Mojacar area although it did mean one day over 400 miles.
Spanish autoroutes are very good (in general) but have relatively few stopping places: so suggest refuel (etc.) when tank down to half.
Many sites discourage "wild campers" by having high fees for one or two nights - unavoidable if you are en route, but it's worth studying the tarrif when you get somewhere you want to stay for a few days - one extra night could make a lot of difference.
Be aware that the Spanish Police aka Guarda Civil are now much more active in traffic matters than has been the case in years gone by e.g. seatbelts and marker platers on outfits longer than 12m total. But driving is still a pleasure compared to UK.
Over recent years there has been a fall-off in attendances, so you should not have a problem about finding a site with a pitch in the months you describe, particularly in the less populated and touristed areas. Pitches may be smaller than in UK - a good pitch in spain is 9m x 10m and electrics may not be more than 6 amps. Down the Med. coast you should not have too much of a problem if you only have a few words of Spanish - some of the larger supermarkets now sign in English, and the food is generally very good, particularly fish and vegs.
Supermarkets do not sell petrol/diesel, nor do they have pharmacies. many shops etc. are closed 14.00 - 16.00 but stay open late.
Inland Spain is desert-like in the south but with wonderful displays of almond and peach blossom in late january / February. The genereral pace of life has, unfortunately, increased somewhat over the years but is still relaxing and friendly. Eating out is fun - many small places have a set menu - Menu del dia - but still with choices for each course and it is still possible to get a good 3 or 4 course meal, with water, wine, coffee etc. for less than 10 euros/head (but watch the wine, particularly the driver). Inland is generally better value than the coast.
Go back through other posts in this topic and you will pick up a lot of good advice. But do try it - pace yourself and go with the flow and we all look forward to you joining the (very unofficial) club. If you see a black bull sticker or the Andelucian "Indalo Man" sticker on a van - this is a styleised human figure with a semicircle of arms above the head, then the owners have probably been to Spain and - if asked - will doubtless be pleased to bore you with how nice it is !
hasta pronto !
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