Yes, please mention/recommend this site.
Using memes, graphics and the Lucretius Today podcasts from this site within your study group should be fine.
Since Emily A. Austin has published "Living for pleasure", her book is my new recommendation to start with. It is not for free but way cheaper than DeWitt's book "Epicurus and his Philosophy", which would then be great as the next book for completeness.
Audio/video material on Epicurus from BBC (within a BBC series on philosophy) seems to be fine but I do not know it firsthand and do not have a link.
It seems you already have enough future participants, which is great because the biggest hurdle to start a group is usually to find enough participants.
To avoid unproductive and divisive debate, it is best to establish rules which outline the scope of interest and exclude partisan politics (unless everybody in the group is politically on the same page, but then, there is no point in discussing politics either.)