Hello Everyone !! I'm really new on BHW

Hello everyone!
I am SEO expert, designer and wordpress developer. I would like to offer my services to BHW, what's the process? When can I open a thread for my services and how should I get my payments because I dont know how can I trust a customer.
Thanks in advance...

Welcome! After you reach 100 quality posts, you can upgrade your account to Jr. VIP here https://www.blackhatworld.com/account/upgrades

Are you really new? lol

Before you even want to start off, you should read the rules of the forums.
You would need an upgraded membership to sell in BHW
You can go either 1 or 2 ways
JR VIP or Marketplace Seller, you can see the difference in explanation here https://www.blackhatworld.com/seo/membership-levels-explained.1038219/

While read the rules of the forums here https://www.blackhatworld.com/forums/newbie-guide.242/
Then work your way to towards https://www.blackhatworld.com/seo/how-to-post-a-marketplace-thread.940635/ and https://www.blackhatworld.com/seo/the-review-process-explained.1036647/

Why did you use the term "really"?

"really" ? Seems as strange as the fish in my profile picture

Hey there, please believe me, I'm an old member here and I didn't buy this account

(mods, it's a joke )

HMMM FISHY
(jk)

I would definitely read the rules of the forum, you may run into a bit of a slump if you don't.

Newbie members are not allowed to sell on Black Hat World. Full stop.

We want to see you putting time and effort into the forum before you start using us as a platform for selling. If you are interested in selling your own services on BHW, these are the ways to do this:

• Upgrade your account to either Jr. VIP or Marketplace Seller membership and create a Marketplace Thread where you can sell your services.
• Upgrade your account to Premium membership and put a link to your service or website in your signature. Jr. VIPs and Marketplace Sellers can also create signatures.
• Contact our advertising support to start promoting through banners and category advertising
• Upgrade your account to Premium, Jr. VIP or Marketplace Seller membership to respond to Want To Buy and Hire A Freelancer requests. You should read the rules for both of these sections here and here respectively.

As you can see, these options aren't really available to you right off the bat. The reason is that we need to see you contributing to BHW in order for us to feel better about letting you use us as a platform for selling your services.
Here's a thread where you can learn more about what you are allowed to do at your member level.

Welcome to BHW and like everyone else said, do go through the forum rules. The rules are quite easy to go through and its quite easy to sell here as per the rules mentioned.