I am about to run my first game and while I believe that I have the knowledge of how to use skills, modifiers and degrees of success/failure down, I am unsure about a few other things.
1) Can PCs acquire any skill they want at first level or just those listed under their specialities? For example: Under the Techmarine Rank 1 Advances on page 90 of the core rulebook, four skills are listed for purchase with different XP costs. But what if that character wants to purchase other skills not listed? Either basic (so they dont have to take tests at 1/2 their characteristic) or advanced? How much do they cost?
Also, when do skill bonuses come into play? Is this mainly during combat or do bonuses also come into play when making various skill tests? For example, if I have a space marine with a Strength 40 making an opposed strength test to break open a door being held shut by someone else, is it Strength 40 + 20 (power armor) for the test? Or is it 40+20+8 (unnatural strength bonus) for the test?
Thanks!