OldShooter
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
If your money is at Fidelity you are not limited to Fido's funds. There are many more options. The books will help you.... I’m wondering who can help me with the administrative aspects of setting up the index funds? Is it as simple as putting a call into Fidelity (assuming I choose their funds)?
But actually doing a buy (or sell) couldn't be simpler. You can do it on their web site with a few clicks or you can telephone and have one of their reps help you. There may be a small charge for using a human instead of a web site but for a long term investor it is negligible, so you may prefer the hand-holding for your initial transactions.
Ref @RetireBy90's comment I don't know why you would not want to just use the accounts you already have, but Fido can advise you on that. I would keep the same accounts so all of my history was in one place but YMMV.