Alex:
Most "newbies" start with the
Camino Frances. It is the most developed of all the routes with the largest number of "services" close enough to each other to give you near infinite options for planning and walking each day. It also (IMHO) is the route that best supports "going with the flow."
During the summer months, when universities are out of session, it can get crowded. Then there is the famous heat in July and August. So, many of the veterans will walk during one of the two "hip seasons." These are from (approximately) Easter to early June, and mid-September through the end of October.
For reference, doing the entire
Camino Frances takes nominally 35 days (+/-). Walking from Porto to Santiago on the Camino Portuguese takes about 10 days (+/-). Both routes have plenty of amenities for first-timers.
There is nothing wrong with the Ingles or any other route. However, my recommendation for a first-timer who wants a "taste" of the Camino, will likely be most satisfied with a segment of the Frances or Portuguese. The other, less traveled routes simply have less supporting infrastructure.
Overall, the
Camino de Santiago is not a back country or "through hike" like the Appalachian or PCT Trails in the US. It is village-to-village hiking. You only need to carry clothes, toiletries and day-hiking supplies.
Personally, I have done five Caminos, including two full
Camino Frances (form Saint Jean Pied de Port) and one Camino Portuguese (from Lisbon). I made a separate trip on the Portuguese from Porto one year.
This year, I start on 13 April from Ponferrada walking the Camino Invierno (the winter route). This route runs to the south of and sort of parallel to the final part of the
Camino Frances into Santiago. It takes a couple of extra days over the CF route, about 10 - 12 in total, depending on pace. However, I have not done it and want to evaluate it as a viable alternative for folks who wish to avoid the relative crowding and commercialism on the final stretch of the
Camino Frances.
Hope this helps.