Yes for sure
Yes ETH is needed to pay gas or transaction fees when swaping coins or tokens
The best way to protect your private keys is using a hardware wallet such as Ledger or trezor. Another way is to use a paper wallet both of which need to be kept in a safe place
Yes MEW will be compatible
Yes you can send and receive coins through Atomic Dex
yes you can as long as you know the old one
Use the link below
Here is a link to a video about Metamask.
You can find the latest version of AtomicDex Pro Desktop by clicking on the link below.