Short answer: Someone else fill this out for me please?
Nun's are Catholic women who devote their entire life to Christ. They live in community, normally called a convent or a monastery. There are 2 types of communities: Contemplative and Active. A Contemplative Nun's "Job" is to pray for the world daily. They live their entire life behind the convent walls, only going outside for emergencies. Active nuns have many "jobs", normally dependent on the community that they enter. Some are teachers, some are nurses, some are missionaries, some work in parishes, etc etc. Pretty much, their job is to serve the world (while they're praying for it, and they're contemplative counter parts are "praying backup").
The normal vow that a nun takes is to Poverty, Chastity and Obedience. Some orders take a 4th vow specific to their order (like the Servants of the Lord and the Virgin Matara take a vow of servitude to Mary). With the vow of poverty, nuns give up all their worldly possessions, including money (so for your question about how much they make, the answer is nothing... any money they receive for anything goes to the community). With the vow of obedience they promise to follow the example and decisions of their superiors as long as it doesn't lead them into sin. Their superiors include the head of the convent (the Mother), the convent's spiritual director (a priest or monsignor) the bishop, and most importantly the Pope.Which ones wear the habits and when?
the short answer to this is that they all SHOULD where habits, and they should where them all the time, except to shower and they have a separate habit to sleep in.
There are no limitations with regards to the religious life: it is a freedom which you choose of your own free will.
Chastity means that you will not have sexual relations with anyone besides your spouse. All people are called to chastity; single people before they are married to not have sex and married people to only have sex with their spouse. Chastity includes much more than just sexual intercourse, but that's the best way to explain it. Celibacy is a form of chastity that religious men and women vow to- it means that they will not have sex because they're not going to get married.
I don't know what you mean by a difference in color.