You can use G Suite also without redirection of incoming e-mails. Nevertheless, if you want to receive new mail in Gmail and try its potential in practice, it is necessary to do following steps.
What do you need?
Your domain provider’s MX records credentials (in order to determine, where to deliver the mail).
What is the process like?
If you are allowed by domain provider to change MX records yourself, set them to Google servers according to this sheet: https://support.google.com/a/answer/174125
If you are not allowed or if you do not want to do it yourself, send a MX records change request to your provider’s support, add a link to the same sheet: https://support.google.com/a/answer/174125
Starting now, your new mail will be redirected to Gmail.