So Infinity looks like a cool, affordable alternative to
40k, and the Haqqislam have me hooked. I'm a philosphy student from a muslim family, and guess what the Haqqislam are philospher, assassin, muslims

(scary how they managed to combine so many things very relevant to me). Anyway enough about that, I have a few questions which I would greatly appreciate if you guys took the time to answer.
1. The Online Store sells two books, a 2nd edition rulebook, and a book called Human Sphere. Do these contain anything different from the free downloads, besides fluff? I'm interested in a sectorial army (Hassassin) so are the downloads good enough for that?
2. What's the average size of armies in this game? like 5-10ish? I assume a starter set is enough for a game. Also the online store is all in euros, but if I'm not mistaken a blister pack of one model is 15-ish dollars USD?
3. Having seen pics of terrain the amount of stuff on the field is staggerring. Do you need to buy wargaming terrian to enjoy the game or will books, shoeboxes, and the like suffice for now?
4. As for painting and assembling is it no different from Citadel metal models? Is it ye olde, prime 'n' paint? I have a bunch of Citadel paints which should work right? And files and superglue are more or less all you need for assembly I imagine.
5. I know for
40k you need some extra stuff besides dice, like the templates. Is there a similar set of peripheral items that are need to play the game?
Sorry of any of these are stupid questions, I just want to make sure I don't do something horrible. Also if you guys have any tips or important information about the game in general, or the Haqqislam I'm all ears. Thanks for your time guys.