Forgive us. On this forum we're a bunch of optimizers. Every good plan can see improvements and we sometimes focus too much on them. What you just did is awesome, and here's how I'd keep going:
The real power of investing is in dollar-cost-averaging. Dumping a large amount into the market at once is riskier than investing over time. While it is definitely 100% awesome that you put money in now, you will REALLY be kicking those investments in the ass if you setup and automatic allotment to transfer to your Vanguard monthly. Even if it's only $100 a month to start, it will be huge.
Here's what dollar-cost-averaging does: By investing the same amount each month, you will be buying fewer shares at higher prices and more shares at lower prices. If the market dips, you're stockpiling more and more shares at low prices. If the stock goes up, you're throttling back the number of shares. This is why many of us on the MMM forum LOVE IT when the market goes down. It means that month's contribution is much more efficient. When I start throwing around large chunks of money (like when I do an old-employer rollover) I get nervous about market timing, start second guessing myself, etc, etc.
It is also a very hands-off way to invest. Once you setup the transfer and set it to monthly recurring, here's what you're doing:
1) Automating something you might be too busy to remember to do on a monthly basis
2) Turning market fluctuations into more $$$ in your pocket
3) Forcing yourself to save this much, which will make you more aware of your spending
3) Allowing yourself to see EXACTLY how much money you're saving. As you flex your frugality muscle and track your spending you'll start to see your costs go down. You may start saying "Wow, I just cut my monthly expenses by $500. Why am I ONLY putting $100 into my Vanguard?" Since you're allotment is setup, you can easily throttle it up to $600 from $100. Now, you can plug your new value in and see your savings rate skyrocket. Then it becomes addicting and you want to get your savings rate as high as you can ;)
Stay motivated with this process. If you need some reinforcement, come back to this forum. That's what I do!