My priest recommended that I get a prayer book. There are so many that I have no clue what would be best. I go to an OCA parish.
Well, if you want a prayer-book that would be in line with your local parish use-
There is the Jordanville Prayerbook, which seems to be the standard go-to with the Russian Orthodox and their descendants. It also has some prayers from Matins and Vespers and the text of the Divine Liturgy
St Tikhon's Prayer Book has the same (and one or two extra) Morning and Evening prayers as the Jordanville, but uses the "Revised" liturgical English, which would be a good choice if this is what your parish uses (Thees and Thous, but not "-ests" and "-eths").
St Herman of Alaska has one which follows the St Tikhon/ Jordanville format, but in Modern English. If your parish doesn't use the "Thees" and "Thous" this might be a good one.
Keep in mind, one probably shouldn't attempt to pray every prayer listed for the Morning and Evening prayers in the above mentioned books from the start- it is quite a rigorous prayer rule, one which I would certainly not attempt (I have enough on my hands with the rather shorter Morning Prayer rule found in the HTM prayer book). Pick one that best suits the language of your parish and discuss a prayer rule with your priest. You should probably talk to him again and ask which one he recommends.
The Morning and Evening prayers in the back of the Orthodox Study Bible are fairly common cross-jurisdictional prayers with less for the beginner to attempt. The Evening prayers are more aimed toward the Greek/Antiochian tradition though- the Troparia for the Evening will be completely different from what you hear at your parish if there's ever a Compline service with the Prayers before Sleep.