How can i get strong calves/legs? and get rid of the extra fat on my upper arms?

i want to get calves bc i think my legs look FAT. and my arms too..(when i wear a long sleeve shirt my arms feel so uncomfortable and my family always feel/squeeze my arms and it's embarrassing..) so what are some good exercises for them to look better?and what is also a good diet for me? i'm a teen.