In regard to what the church teaches about Evolution, yes you can believe in evolution.
Regarding repetitious prayers, in the Book of Revelation it talks about the Angels reciting the same prayer and praises to God over and over again night and day.
A repetitious prayer can silence and still the mind, which even many secular people have proven is good for a person , even physically, but also , when the mind is still and void of thought, it enables a person to better hear the still small voice of God.
The Rosary always brings me a lot of Peace when I am anxious , even if I just recite a decade or half a decade, or pray small prayers on the beads.
If such prayers don't do anything for you , the church doesn't say anybody has to pray those prayers, and your emphasis should be focused primarily on relationship with God. If it doesn't bring you into a deeper relationship with God , then I wouldn't recommend it.