Question about learning Ancient Greek

Hello there! My situation might be a bit different than others who've asked similar questions - I am heavily considering taking Ancient Greek next year (my school's Greek program is very strong, although only a few geeky classics students really do it). I love Latin and have almost finished my fourth year studying it. If I take Greek next year, I want to learn some and get familiar with grammar/vocab (alphabet obviously) before I start. Any tips on what books/resources I should take a look at relating to my self learning of some of Ancient Greek would be extremely useful! Thanks!