It might be in your interest to invest in a book. There are several textbooks available here on Textkit, (for example, White's First Greek Book) but you might find them frustrating, as they are all quite dated. However, given your background in Latin, these courses would be less problematic than they could be (they often presuppose a knowledge of Latin). I suppose it depends on your preferred learning techniques. The Athenaze series is popular, as it couples reading sections with grammar. I've also used Mastronarde's Introduction to Attic Greek, which is quite formal in its approach, but very solid.
Horae quidem cedunt et dies et menses et anni, nec praeteritum tempus umquam revertitur nec quid sequatur sciri potest. Quod cuique temporis ad vivendum datur, eo debet esse contentus. --Cicero, De Senectute