Explain to me how you would build a wand marauder.

Don't expect to use a wand anytime soon. I didn't get to start using wands until I hit int nodes near the Conduit keystone. That's a friggin long ways into the tree. I could put on two int rings and an int necklace and still not be able to use wands, not counting the fact that doing so would probably kill me. So if you want to use wands you won't be until around level 40 and if that bugs you you may want to make a wand Templar instead.

I'm still unsure about support gem choice. You'll have to get lucky to get a greater multiple projectiles or chain, since count them out for Marauder quest rewards. You also have things like faster projectiles or weapon elemental damage. I'm also having trouble finding gear to fit all the sockets that would beef up the wand (like life leech + added fire damage + multiple projectiles + frenzy).

Its worth it. I went through 40 levels of using nothing but Heavy Strike + Cleave becoming rather bored until I could finally use a wand. Once I did I joined a party and had a blast. Its awesome, tanky, and great fun in a party (parties are a must for this I am thinking). Blood Magic lets you cast Power Siphon and Frenzy and other skills essentially for free. Auras don't put a dent in the health pool (I don't use percentage auras).

You have try very hard to die. 40 levels of HS + Cleave was pretty darn boring but I couldn't complain considering I could just stop, open my inv/passive tree, and mess around while mobs wailed on me without doing any damage.

You are a pick-up-group hero. You keep full stacks of all charges up, keep multiple auras up, and you share them all with the party. I also use rejuvenation totem, and its role in a party is obvious.

I grabbed a big mace and Heavy Strike + Sweep'ed things until early Act 2. Its faceroll easy, and throwing on a coral amulet with all the early health passives means I can't remember ever using a health flask outside of boss fights. Mana is irritating but flasks keep it going easily enough. After that I threw on a sword n board and cleaved + Heavy Strike's everything to death since I was tired of missing with a slow weapon. I imagine you could just continue on with a 2-hander and use things like Leap to at least make leveling more lively. I would do that in retrospect. Maybe even veer off in the tree for it and just respec. I grabbed all the gear I could with +life and life regen. I kept the wand gems I planned to use always equipped so I could level them. Frenzy is great as melee just as much as it is ranged.

I did not take Blood Magic until I had both life regen keystones (2nd is near the bottom of tree).

I use Frenzy, Power Siphon w/lesser multiple proj, Enduring Cry, Rejuvenation Totem, Anger, Wrath, Projectile Weakness curse. I would ideally like to use Frenzy with LMP or GMP + Added Fire dmg, Life leech, and faster projectiles since I have all those but don't have the sockets. I would save Power Siphon as a nuke but keep stacks up as needed, maybe socket it with weapon elemental damage. I really am not a pro at this.

I would be using Grace if I had the dexterity for it. Won't until that +30 node near the witch area.

I party up and spam skills with infinite resources, really. Spam projectile weakness on everything (more damage obviously but you also wont miss), use enduring cry if you want to beef everyone up, drop a rejuv totem here and there, etc. Its very easy, I just need the right supports to do more damage now.

I am thinking that once I can link +fire damage and +elemental weapon damage to siphon, it would do considerably more damage. The passive keystone I took to improve fire damage currently only applies to Anger, and I would like it to apply to those supports. I would imagine a wand with +fire dmg would be helpful as well.