To buy Bitcoin from a member on this forum, you can open a thread on
Currency exchange. Your account is new and not yet reputed, you will need to use an escrow service on this forum, there are some reputed escrow service providers which are reputed members on this forum, you can make use of anyone of them.
Recommended bitcointalk escrow servicesIf you are privacy conscious, you can make use of
https://bisq.network,
https://hodlhodl.com or Localcryptos. They are the best for privacy as they are decentralized.
If you are considering fee, you can make use of Binance that require zero fee for p2p trading, but you will need to provide kyc which will surely lead to privacy invasion. Also know that sending bitcoin out of exchanges like Binance require very high fee.
You need to also be very careful of scammers.
Checked bisq, they don't accept PayPal. I had no problem using Paxful because of low amounts they don't require but their sending out fees is huge.