@Joakim1992
Try these steps:
1. Navigate to https://admin.powerplatform.microsoft.com/environments
You need to either be a global admin, or at least, have the appropriate Power Platform admin role to do this.
2. Click on New

3. Make sure to set the "Add a Dataverse data store?" to Yes
Also, fill out the Name, select the Type to Production (or Sandbox if this is for testing, you may change it from Sandbox to Production later or vice versa).

Then click on the Save button.
4. On this screen which should be called "Add Dataverse", make sure "Enable Dynamics 365 apps?" is set to Yes

Note: Sales Hub may comes pre-installed and may not need to be explicitly selected for installation.
If you are able to, select Sales Hub or whichever other ones you want to automatically install from the "Automatically deploy these apps" section,
If it's not possible to select anything, you should be able to do this later if needed as long as you make sure the "Enable Dynamics 365 apps?" is set to Yes
Fill out the other required fields, such as especially the security group field (click there and just select None, if not yet sure. You should be able to change this later if you want to restrict access to an Office 365 Security Group).
Click Save at the bottom.
The Sales Hub may just be installed anyway after this deployment even if you didn't select it from the "Automatically deploy these apps" section earlier, as long as you had:
- "Add a Dataverse data store?" set to Yes
- "Enable Dynamics 365 apps?" set to Yes
If you want to install Dynamics 365 apps after environment deployment, use the below steps and see if they work for you:
For your tenant:
1. From https://admin.powerplatform.microsoft.com/environments click Resources then click Dynamics 365 apps from the left side.

2. For example, suppose we want to install Dynamics 365 Customer Voice
a. Select one of the apps from the list by hovering over the row, then clicking slightly to the left of the text where the circle is shown - it should turn into a purple checkmark now.
b. Then click Install at the top.

3. Wait for the installation to complete.
If you see a "Manage" instead of Install, click that, and you may be taken to the new cloud solutions deployment page however, for most of the apps you want, it should say Install.
Also, note that Sales Hub may not be listed because it may already come pre-installed immediately after the deployment.
For a specific environment (note: you may have to follow all of the above steps first, then these steps below after that):
1. Open environment for editing by going to https://admin.powerplatform.microsoft.com/environments and from the list of environments, click an environment.
2. Click Resources at the top then click Dynamics 365 apps

3. Click "Install App" at the top.
4. In the flyout menu that appears to the right, select a row that says the app you want to install, then click Next at the bottom.
5. In the installation screen which now should be showing in that same flyout on the right side, click the Terms of service link to read it if applicable, then click on "I agree to the terms of service" checkbox, then click "Install" at the very bottom.
See if this helps as starting point @Joakim1992