Custom apps and workflows in Slack

I need to create some custom workflows and apps to improve efficiency within our organisation. We heavily use slack so the more we can do everything from there the better - I need someone familiar with the info in the following links:
• https://api.slack.com/apis/connections/events-api#using-events-api
• https://api.slack.com/events/message
• https://api.slack.com/automation/workflows
• https://api.slack.com/automation/triggers/event
• https://api.slack.com/automation/functions