If you are looking for more information than is on this site, here are some other excellent resources that we encourage you to utilise on your spiritual journey.
Beth Midrash Ohel Moshe is led by Mori (Rabbi) Michael bar Ron, an Israeli rabbi who seeks to revive the more ancient observance of the Torah. His website has some great resources.
Founded and led by Rabbi Tovia Singer, Outreach Judaism is truly a treasure trove of information waiting to be discovered by everyone who is searching for the Scriptural truth. You can also find Rabbi Singer's Youtube channel, where you'll find quite a few fantastic teachings.
Tenak Talk is an internet talk show, complete with guests, where the topic of discussion is always based on Scripture. The host of the show, William Hall, is a Christian-turned-Messianic who then left Messianic Christianity when he realised that the New Testament really isn't everything it's made out to be. You can watch the show on the website or on the Youtube channel. Be sure to tune in for a live show, you can call in with any questions you might have and they will be answered on the air.
Jews For Judaism is probably the oldest and most well known counter-missionary organisation in the English speaking world. There are many great resources on their website as well as on their Youtube channel. The majority of their resources focus on what Judaism and Jewish Scripture teaches, and don't really worry about trying to counter the claims of missionaries. They let Scripture counter the claims of missionaries.
Truth 2 U was founded by Jono Vandor of Australia, a Protestant Christian who discovered his Jewish ancestry. Jono left Christianity behind, and now devotes his time to publishing practical and useful audio for people who want a deeper understanding of the Jewish Scriptures, the Tanach.
Judaism's Answer is a website that brings a Chasidic perspective to the counter-missionary world.
Chabad.org is a fantastic resource for anyone looking to learn more about Judaism from the perspective of the Chabad-Lubavitch movement.