It probably goes without saying, but the first step for anyone wanting to learn Ancient Greek is simply sit down and learn the alphabet.
You'll need it to read.
You'll need it to look up words in dictionaries.
You'll need it to eventually pronounce words.
A fun way to practice is just write English words using the Greek letters like a code. It reinforces the system. in 7th grade, high school, through college, I'd take notes in class in Greek letters, and I still run across those notebooks in a drawer once in awhile.
Just sit down and do it.
Many are the same or at least similar. It just takes practice. Here's one to decipher:
Ι ΚΑΝ ΡΕΑΔ ΓΡΕΕΚ ΛΕΤΤΕΡΣ. ΛΟΟΚ ΑΤ ΘΑΤ!