Hi IvySkye,
Happy Planning, it's an exciting time getting ready for your first Camino.
My thoughts on a couple of your questions.
1) What are the best routes/modes of transportation to get to SJPP?
Next time I would probably take the train option as suggested. However, as time was an issue we caught the shuttle bus from Charles De Gaulle (International) to Orly (Domestic) airport and a flight to Biarritz (Bayonne) then Bus or taxi into Bayonne and train to SJPP.
2) Is a 35 liter big enough, or should I get the 45?
Although I agree that 35 litre is big enough, most people focus on the fact that you might be tempted to fill the bag with stuff you don't need. We took Osprey Kestrels (48 Litre) but only packed 8-9 kgs, but the larger pack was great for 1) Not having to cram sleeping bags & gear every morning 2) Being good for carrying your bread & fruit and daily stuff.
3) Boots or hiking shoes? Leather or Gortex?
My preference is light weight, waterproof, some ankle support (lots of uneven surfaces).
4) Walking poles? I've never hiked with them before.
This might depend on age & fitness but I would most definetly recommend a set of light weight poles, I found them brilliant.
5) Has anyone walked in October?
Not yet but hope to next time.
6) Poncho, rain gear, rain pants? What is necessary?
We took Jacket, rain pants & Ultra-Sil Tarp-Poncho - Sea To Summit (very light & expensive) & used everything at some stage. Next time I will take just an
Altus raincoat (plus light jacket) (You will find a lot of posts about
altus rain coat on this site)
Buen Camino
Col