The first Belarus postage stamp was issued on 20.03.1992. It depicts the cross of 12th century. A lot of Belarusian definitive stamps were printed with small face values (0.30R) and high values (50 000R). In 2008 Belarus post started to use stamps with letters A, B, later C, K. Now the most "popular" chars are H, N, M, P. You can find stamps scans, short description and Michel catalogue numbers of all Belarus stamps issued from 1992 till today by the link below.
BELARUS MINT STAMPS