Aequitas,
If you are comfortable with following along with the mass, sit anywhere. If you feel awkward about it you can sit in a pew in the back. If you want to say the responses you can, if you don’t feel comfortable just listen. When time for communion comes along you can go up to receive a blessing if this is a practice in the diocese. Some dioceses don’t do this so if you go up the priest may try to give you communion. Do not receive communion even if offered by mistake. Since you are not yet in communion with the Catholic Church through confirmation, you shouldn’t receive the sacrament which is an example of communion.
God Bless,
matthew