1) Yes you can, pretty good opsec.
2) No, you just have to verify your email.
3) The fees are better than bisq, check there for details 👉 https://www.bullbitcoin.com/rates

You can use https://mission.bullbitcoin.com/bhodl when you register for extra sats!

nostr:npub1rxysxnjkhrmqd3ey73dp9n5y5yvyzcs64acc9g0k2epcpwwyya4spvhnp8 have a nice tutorial that explain it all 👉
 nostr:nevent1qqs0t9a9a5dal5euud2y62p873093mfxd3nnurj25watvuwjzyudfecpp4mhxue69uhkummn9ekx7mqzyqvcjq6w26u0vpk8yn695ykwsjs3sstzr2hhrq4p7ety8q9ecsnkkqcyqqqqqqgjmq26v