[2] Bestle apprenticed as a wine merchant in his father's company from 1870 and then continued his education abroad where he spent most of his time in Bordeaux.

[3][4] Bestle was licensed as a vintner in 1882 and purchased a minor wine store in Nørre Voldgade.

In 1886 he also purchased Gottlieb Bonnesen's wine store at Skindergade 47 and moved his business to this address.

His wine house experienced a commercial breakthrough in 1888 and over the next few years developed into the largest company of its kind in Denmark.

He was a member and for a while president of the Association for the Preservation of Old Buildings (Foreningen til gamle bygningers Bevaring).

He was also a board member of Aktieselskabet til oprettelsen af billige pantelånerkontorer i København and a driving force behind the establishment of Understøttelsesfondet in 1924.

His second wife was Selma Anna Elisabeth Blaumüller Fleisner (30 April 1866 – 30 June 1947), a daughter of a weaver named Anton Georg F. (1833–1885) and Vilhelmine Caroline Schoch (c. 1840–1869).