Model number 81MV0001US does not have a CD/DVD drive built in. Yes this system is easy to initially setup. Just follow the audio instructions provided by Microsoft Cortana when you boot up the computer for the first time, or follow the onscreen instructions to activate Windows 10 for the first time. The heart of the Lenovo IdeaPad S145-15 laptop is the Windows 10 operating system. With regard to learning your way around Windows 10, you may want to try YouTube.com (just type that address in your browser address window). There are hundreds for free instructional videos there about Windows 10. Just type Windows 10 Introduction in to the YouTube search window. You can watch free videos there that will show you the basics all the way up to tips and tricks videos and they're all free. Finally, The lenovo S145-15 is an entry level, light use system with its Intel Pentium processor. It is not meant for multi-tasking or demanding programs. It is good for Microsoft Office and light internet browsing. If this describes your computing needs, the IdeaPad S145-15 would be a good choice. For 2018, Lenovo retained its place for a second year as the best laptop vendor:
https://www.laptopmag.com/articles/laptop-brand-ratings

The Lenovo IdeaPad 130-15 laptop is a mid-level, moderate use configuration, with its AMD A9-9425 processor. This Dual-Core processor has a base speed of 3.1GHz and a boost speed of up to 3.7GHz. This configuration has 4GB of DDR4-1866MHz RAM and a 128GB solid state hard drive. It is good for moderate Microsoft Office type programs. More advanced, resource hungry work with Microsoft Office programs that are extremely large and complicated, may be too much for this configuration.

Yes. To enable offline access, go to your Google Drive page and click the gear icon in the upper-right corner and select Set up Google Docs offline. A window will pop up with a two-step setup process. Click the Enable offline Docs button and then for Step 2, you will need to install the Drive Web app for Chrome. Here is a link to more information about Google Docs Offline: https://support.google.com/drive/answer/2375012?co=GENIE.Platform%3DDesktop&hl=en. If you download the reading APP from the Google Play Store and then download an eBook to the device, yes you can read an eBook off line.

This model is not user upgradable. A certified technician must do all of the work, so as to not void the warranty. Check with your certified technician for your options.