Good decision.
The most important thing is that now you understand that before you did not have the private keys (=the passwords for bitcoins), now you have them.
The security of the private keys depends on how much you are able to secure the 24 word seed. If you do not know now what it is, it will be the first thing you will work with after you connect the Ledger.
There are 2 contradictory issues that you need to solve:
1. You absolutely do not want to lose the seed. So you need to store the seed and at least 2 independent copies of the seed somewhere (like at home, at office and at your parents/kids etc). You must forget about writing the seed in digital way to your computer, phone etc, because viruses already seek for weird 24 words.
2. You do not want anyone else than you to see the seed (so the more at more places the copy is the more it can be compromised). So you should somehow obfuscate the seed.
Anyone who sees the seed has immediately access to coins. That is what you must remember.
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Hope you ordered the ledger from Ledger website and not from Amazon.
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Now (2020, 2021) should be interesting times to hold your coins and not to sell them. Your wallet is ideal for that. Forget coinjar.
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Once you set up the wallet, send there coins worth of few dollars. And try to send the coins in between your accounts..
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While sending coins, you can set up the fee. Ledger sometimes does funky things and puts the fee way too high. You can always manually edit the fee to 1 sat/byte and most of the times the transaction will be still fast. (You will see the txid immediatelly if fee is too low, just the transaction will not be confirmed; unlike at coinjar where they did not even try to send the money).
If you talk to God, you are praying; If God talks to you, you have schizophrenia.