Fidelity has great customer service, they have made my rollovers very easy in the past, but I know this is a Vanguard community, I just had Fidelity setup much younger, so was easier for me. I agree that some more information is needed.
I know there are specific rules regarding the inherited IRA, some you can delay taking money depending on who you inherited it from and what age they were at death, but that should be fairly standard Q&A.
If you have to start receiving RMD's in the current year or next year, and your 401k/527 are under-funded, you will be taxed on the RMD's, so you could use it as an opportunity to fully fund retirement plans at tax-deferment and use the RMD's from the inherited to supplement what you're putting into your retirement plan(s).
I wouldn't take a lump sum unless you're not working, as that'll be taxed at a higher rate, so spacing it out probably makes sense. But it all depends on when you'll retire and what money you're making now and the years of RMD and how much you'll be taking out during retirement. It's all about trying to pay the least amount of tax possible based on your current and future situation.