You need to bring your own IPs and warm them up with legit emails. People abuse shared cloud IP addresses for spam, so you're going to run in to problems if you want to use them.
Sorry if the question is a bit noob, feel free to point me at any resources and I can do some reading myself too
Once you get big enough, you can consider buying an IP address prefix, getting your Autonomous System number, setting up peering, etc. For example Mailchimp seems to have AS14782.