You are new to Adobe Campaign Standard and would like to know how to start using it? This topic is made for you. Let's have a look on the first things you need to know to use Campaign's core features.
If you want to learn about Adobe Campaign Classic, go to this post: First steps with Adobe Campaign Classic - v6/v7? Key concepts
.1. Getting familiar with user interface and key concepts
.2. Marketing campaigns
.3. Reporting and managing non deliverables
.4. Subscriptions and Services
Manage profiles and subscriptions to services using the Adobe Campaign REST API, available on Adobe I/O.
There is no direct transition path as they are 2 different solutions. Because of the current way ACS is implemented (hosted only, PostgreSQL only, etc.).
However, if you are using Campaign v7, there is a connector that allows to leverage some of your v7 data into ACS, to start implementing some of your use cases in ACS and have a better experience. If you'd like more information about this connector, please have a look at the following docs: Principles and data cycle
Let me know if you have additional questions,
There is no official "comparison" document that lists all functionalities, mainly because in ACS each functionality is re-worked to provide a better experience and might work slightly differently than in AC Classic.
I think there is a thread covering the most important differences between the 2 solutions: What is Adobe Campaign and what are the differences between Adobe Campaign V6.11 and Adobe Campaign ...
Hope this helps,