I'm a new member here, but I am a very enthusiastic Alien fan and am so glad there is finally an RPG set in one of my favorite settings! I'm not particularly experienced with playing RPGs (have played D&D 5e, Rogue Trader, and Only War), and have never GM'ed, but from what I've seen I feel I would love to GM games in this setting. However, I'll admit that while I have written stories before, I would really want some inspiration for things like character types/personalities, and just helping to flesh out from a general idea into something that could be an actual full scenario.
The core concept is this:
The PCs have all won free tickets on a luxury space cruise, all expenses paid. However, it turns out the cruise is actually a front for the Church of Immaculate Incubation, who plan on impregnating their guests while on the ship, and letting them off at their stops none the wiser, so they may spread their "gift." I think the idea could be really fun if played right, but I need a lot more details, such as breaking the structure into 3 Acts, figuring out how the PCs can determine what is going on without just flashing it in front of their faces, and possibly figuring out a system for improvising weapons since a cruise would not allow firearms aboard (nor would any staff have a reason to carry any), and I believe players should always have at least SOME way of getting tools to defend themselves
Anyways, if anyone has any ideas for how I might approach developing this idea, or any inspiration, please let me know!