Confirmation: Not ordinarily prepared for with RCIA, though some parishes do it that way. Talk to your priest about how in your parish adult Catholics who have had First Communion but not Confirmation prepare to receive that sacrament.
Fasting: Mandatory on Ash Wednesday and Good Friday for those who are able to. During these 24 hour days (it’s not just when the sun is up like in Islam) one should eat only one meal, though one may take a little additionally food once or twice in addition to this for the sake of strength, as needed. There is no limit on drinking beverages with calories on these days, but obviously this should not be abused to get around the spirit of the fast. It is a very good idea to voluntarily fast at other times of the year (especially during Lent), but that is up to you.
Abstinence: Traditionally, this meant consuming no meat on Fridays or on Ash Wednesday. This is the current norm in England and Wales, but in most of the rest of the world it is only mandatory on Ash Wednesday, Fridays in Lent, and Good Friday. On other Fridays in the year one is either encouraged or required (depending on the country) to observe some sort of penitential practice on other Fridays throughout the year, whether giving up meat or something else.
Covering up crucifixes: There has been a lot of confusion on this point, at least in the United States. It is dealt with in the early chapters of Mass Revision by Jimmy Akin, but after about 15 minutes of searching I’ve given up trying to find the passage. The rules in the United States were one thing, now they’re something else, and in my experience no one seems to quite know where we’re at. I believe there may now be multiple options to choose from. Given the current state of confusion I wouldn’t worry about whether your parish is “doing it right.” They are presumably doing what they believe to be correct.
