SAMCA
Alicante base - you will be able to express a preference however you might well be recruited for another base initially, it depends on commercial requirements. Base transfers are usually pretty swift.
Time to Command - depends on you really, and the number of hours you have/work. Alicante based guys don't do a lot of hours so if you are joining with little experience it will take a while. There isn't a seniority list, you apply for consideration when you have the required experience and believe that you are ready.
4 sector days - almost none.
Training pay - I believe that you are paid fully during your training. Per dimes are at a reduced rate during the type rating which I believe is funded by Jet2 in lieu of a bond.