This is off-topic even by my standards, but here are what a couple of Greek textbooks suggest for pronouncing α:

J. W. Wenham's The Elements of New Testament Greek (very popular in its field): pronounce "like a in French 'à la.'"

Clyde Pharr, Homeric Greek, revised by John Wright, section 501, Phonology, "a as in father (when short as in aha)."