Agh, sorry for not remembering to check out if you had any more questions..
Yes, the Summon/bone build I recommended requires marrowwalks. If you don't have marrowwalks then don't worry, they are easy to get, and someone from these forums will gladly give you a pair. (If you play on Europe, tell me and I'll help you
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Strength should be aimed at the requirement of your armor, and later on pumped to a max of 118, which is required for marrowwalks. Eventually, if you are going to start dueling with your necro, you might want to use a stormshield (req str 156), so be sure to have enough stat points reserved to raise your strength. Socketing your stormy and putting a - to requirements jewel / hel rune in it is a good idea, since this will drop the str req to around 140.
Max blocking is always good, so you might want to put around 160-170 points into dex (marrows will give you +17 dex + you will likely get more from other gear), since max blocking on a lvl 90 necro with stormshield/homunculus requires about 210 dex. However, it's completely up to you. If you only play & magic find with your necro, then you don't have to get max block.
Rest goes into vita. Energy in not required, since you can always drink mana pots.
Kendu already completely explained crafting, so no additions there.
As for skills, starting up, you should max raise skeleton first and skeleton mastery second, while placing 1 point in all of the other available summons and curses you are going to need. After that, start pumping bone spirit, then bone wall. After you have completed placing all the neccessary skill points, just put the rest in bone spear for synergy :thumbsup:
