I am not sure how to put them in FPS reloaded
but there's quite a few packages, for 3d modelling i'd recommend Blender - since it's completely free AND you can sell the things you make with it.
Now, i'm not sure if you do plan on making money on this, otherwise you could get the student version of 3ds max, which is also free - but you cant sell what you make.
as for textures: Photoshop if you got some money to spend, otherwise i'd suppose Gimp is alright. not sure but I Think Gimp allows you to sell the stuff as well.

Whose eyes are those eyes?