For the exporting, Tessnip or it's Skyrim version, Tes5Snip. I didn't know the exat process though. The stats editing, can be done by the same program or by Skyedit.
No. Exporting = game ready.
@OP, you need Nifscope and a tutorial telling you how to import your shape into a vanilla mesh. It will then be game ready and then TESVSnip or SkyEdit can get it in game.
Read this thread, all of it. http://www.gamesas.com/topic/1338001-someone-please-help-me-convert-objs-to-nifs-nothing-works-over-here/