Connection
Your server has a play address the moment it is ready. You copy it from the panel and paste it into Minecraft; that is all a player ever needs from you.
Bedrock players on a crossplay server use the same name with a port next to it. The article below covers both editions.
Connection articles
Delivery: most servers are handed over instantly and run within seconds of payment, the rest follow within 60 minutes during the day and within 12 hours at night.