Greetings and welcome! Congratulations on the upcoming Baptisms and welcome to the young ones to the Family!
Yes. You may have the same godparents for each of the two girls. 1 male and 1 female is correct. The godparents must be practicing Catholic in good standing, over the age of 16, and have received the sacrament of Confirmation (been Confirmed). If one of them is not Catholic, s/he may be a witness (not a godparent).
1b. In my Diocese in the USA, the parents and godparents must attend one or several Baptism preparation class/es, depending on what the Pastor requires.
Baptisms are arranged with the Pastor/Priest. At my parish we do not have Baptisms during Lent.
Not a problem at all. The Baptism class might be a “way in” for you to find out about RCIA. Your husband will be the one asked most of the questions – if any. Many Pastors and Priests see this as an opportunity to bring people closer to Our Lord. Priests simply want to try to make sure that the child/ren will be raised in the Faith. That is because of the promises made at Baptism.
You are most welcome to attend Mass. Simply refrain from receiving Holy Communion. Some of my non-Catholic friends feel rejected by this. However, it is not a rejection. It is simply something that is so . . [inexplicable], that we must prepare for and be as “worthy” (in state of grace) as we can be. Not all Catholics may receive either.
If you do decide to join the Faith, depending on how it is worked out at your Parish, you may be able to Receive (have Communion) as a family with your husband and daughters on their First Holy Communion. This is an event to which to look forward.
I hope this helped a little.
Congratulations and welcome! I will keep you in my prayers.