How to determine which OCI products to buy for my needs

Summary:

I have an OCI free account and I want to upgrade to a paid account. I am trying to figure out which of the many OCI product offerings provide what I need.

Content (required):

In the "Cloud Cost Estimator" page ( https://www.oracle.com/cloud/costestimator.html ) the descriptions of the options are too high-level for me to understand which ones contain what I need.

So I am looking for advice on figuring out which OCI products I need to buy in order to achieve the following configuration:

- A Windows instance, accessible via RDP client. I had successfully created and used one, before the free trial account expired and the instance got deleted.