Getting my army in a day or two

I am getting my army in a day or two and I know the codex and the battle thing for a hundred bucks is essential for a DE army but is there anything else that may seem essential like certain types of troops or models? Right now, the battle box will have most of what I have written up for troops, I will just have to get two venoms and a pain engine to have my whole 750 list as well as a succubus. So, I know dice and tape measures are important but is there anything else as well I need?

A good set of dice, personally I don´t like the gw once. My gw dice seam to always roll more ones than any other number. You also need something to represent pan tokens, a simple marker lika a base with a painted dark elder rune will do.
Other than that, you need opponents to play

Hope you enjoy playing with your new toys, happy hunting

Thanks, I hope to get a nice set of dice. As for opponets, may bring my army with me when I go to school so I can hop on a bus after classes to go to a game store to play someone

You will also need some kind of Objective marker unless your opponents bring them.
Depending on the type of list you want to build you may not need the Battleforce. It is a great starting point but lacks a second transport or even a 3rd. If you do not use Reavers then they are really only useful for conversions. You will also need an HQ of some kind.

When it comes to dice the rounded edges are always slightly different and effect how they roll. Any round edge dice from any company has a chance to roll more of one number than any others due to the curves.

Alright, I'll see what I can do about objective markers. Well, my current list uses everything in the box but I need to buy a pain engine and two venoms and the HQ to fill out the rest of it but I am toying with an idea that would get rid of my raider in place of two venoms. I am up in the air about reavers, unsure if they will be useful or not for my plans. That is why I am asking for advice and opinions. Thanks about the advice about the round edged dice.

Edited - SO, I'll be buying my normal army of forces for my current 750 list and if I have the money I will buy two venoms and maybe a squad of reavers ontop of my list so I have both of my lists ready.

On markers and pain tokesn: A lot of those items can be made from spare bits. Raider spears, prows, extra head (better yet, if you can bum some bits of other players, their armies heads), the extra rifles, etc...

First off, MSU and venom spam is great way to make your opponent decide, what is his priority target.
Downside: two unites of 5 and transport cost more than one unite of 10 in a raider.

Second: warriors are best used for gunboats or large blob, in cover, objective holding.
Downside: a tau suicide-suit will wreck your face - twin flamers, shieldgen.

Wyches: good tarpit or acceptable killing unite for its points, great TH if used in msu hwg.
Downside: out of cc, they die fast.

Reavers: build your army around them or give them specialist tasks - reference: Mushkilla http://www.thedarkcity.net/t3946-the-black-buzzards-battle-report-links

Pain tokens: i use card glass-gem marks, or, in case of my incubi, for every paintoken - up to 3 - i used specially painted models, replacing the ones in the squad. If they die off - didnt happen so far - then i start marking it with gems

Well, circumstances made it that I can't get my army yet. Have the funds but transportation had to cancel on me so next time I could get them is when I start school again and with my classes being everyday and the homework being daily, yeah I may not be able to play with real models for a long while. Still will be tinkering with lists though.