What was the rewards did the monks get in the medieval time?
Since monks were forbidden to own anything, or have anything they might call their own, or receive anything from anyone without passing it to the superior of the monastery, the idea of monks being given any kind of reward is contrary to the Regula Benedicti (Rule of St Benedict).
Monks sought no reward and simply strove to be worthy to be taken into Heaven when they died; beyond that the idea of reward would be alien to them.
Monks of the middle ages copied books by had, and in this way produced manuscript copies. This was the only way books were published at the time, and it was nearly always done by monks. The book they copied most was the Bible, but they did other works as well, and most surviving medieval literature was copied by monks at one time or another.
The Medieval era spanned a millennia and many monks lived during that time- there's not going to be any definitive answer. What I can tell you is that common building materials included wood, mud brick, stone, and rushes and that monks' houses were probably built to the method of whichever era they lived in.
Medieval monks practiced vows of chastity, silence, and poverty, which is why they generally lived in communities together. As the middle ages wore on, corruption ran thick, and monks found loopholes to communicate with one another and reasons to practice simony, which is the selling of church positions. They also sold absolution, which resulted in bloodthirsty warlords having private abbeys of monks who solely prayed for their patron's eternal soul.
Medieval scribes were clerics, a word that came to be changed to clerks. They wore clothing similar to those of teachers, monks, or priests. That is to say the clothing was simple, somber, and neat. The cut would have been very conservative for the time and place, but that varied with time and place.