The Holocaust is an important topic not only in Jewish history, but in the history of humankind. The topic is disturbing, and it is appropriate to feel uncomfortable and upset by the stories, the facts, and especially the images.
Your first step should be to approach the organization Nefesh B'Nefesh, which works with the Israeli government and The Jewish Agency for Israel to “remove or minimize the financial, professional, logistical and social obstacles of aliyah and the move to Israel.” They will walk you through the process.
On the Jewish calendar, holidays begin in the evening, at sundown, and they continue through the next day.
This general-use prayer includes a fill-in-the-blank line so it can be used in the immediate aftermath of such an attack.