There are ways to keep this all simple and you are very definitely on the right track by getting out of Prudential and fully into Vanguard. Just doing that bakes in a lot of important good decisions. No one is born a good investor and everyone can learn the basics, which are all you need. Knowing what I know now after my wife and I have worked regular professional nonprofit and government jobs, invested for 22 years, and became members of the "double comma club", if you will, well before 50, I suggest you simply:
1) Get the money into Vanguard but not buy anything just yet;
2) Look through Vanguard's offerings of All-In-One Funds, paying particular attention to the LifeStrategy and the Target Date selections, since those all consist of highly-diverse, low cost index funds, which is what you want;
3) Talk to the good folks at Vanguard and tell them your goals for this relatively long term money, admit your current lack of knowledge, and say you want the simplest solution possible for the lowest fees, which is why you are probably most interested in finding either the right LifeStrategy Fund or Target Date Fund. Vanguard is uniquely trustworthy among investment companies because it is a co-op owned by you, the shareholder. They aren't trying to make Wall Street happy or sell you stuff you don't need.
4). Ask Vanguard about buying the fund all at once or buying it over a period of time. I believe in buying it all at once since no one can predict the markets and so that you are fully invested at all times, though other smart people here will counsel differently.
5). Enjoy your life and don't fiddle with that IRA until you need the money, at which time you call Vanguard again for further advice about spending.
6). Then, commit to reading the books and blogs recommended by members in this ER Forum, even if just one per year, so that you understand better why the above recommendations are solid, simple and will let you outperform most every other investor, professional or not, who wants to make things more complex and risky than they need to be.
I know that well-meaning others will quibble here and there with these suggestions but my own experience shows you can't go too far astray with them. Good luck!
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