This sentence is a very often used expression.  It is used when something successful has just happened, and there is the hope and potential for more success in the future.  The expression can be used in business or in personal relationships.

這可是大好的開始！

如俗話所說「好的開始為成功的一半」，本句乃是稱許對方，在生意上或人際關係方面已有相當進展，可望未來更進步、更有成就的意思。是英語常用語句。