Yes, you can use a compatible wireless printer. You must first install Google Cloud Printer then pair the Chromebook with a compatible wireless printer, per the printer manufacturer's pairing instructions. Here is a link to instructions for setting up Google Cloud Print and a wireless printer with a Chromebook: https://www.laptopmag.com/articles/how-to-set-up-google-print-on-your-chromebook

This model ships with Windows 10 S-Mode 64-bit Operating system, which includes a 30-day trial of Microsoft Office 365.

That really depends on the requirements and compatibility of the software. We recommend you check with the game's software publisher's web site for their compatibility with Windows 10 S-Mode 64-bit operating system (Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost.) and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration

Yes, the maximum RAM this configuration can support is 8GB DDR4-2666MHz RAM. There is one memory slot, so you will need to replace the 4GB stick with an 8GB stick.