Need help in creating a builder based on ue4

I creating a builder based on ue4, and I ran into a series of tasks that I can not find information on the forums. I need to understand where and how to look for a solution. I need something like vr editor but in game mode.
I need tools that are shown in this video https://youtu.be/ZtfelOFLMEM?list=PLa82nJCoLyeaTVV-Wz0scZBqeRVSUAGVt I want to make these tools myself.


Here are the tasks ahead of me:

  1. Manipulation of objects in game mode like in editor mode with axes coordinates, Pivot point, and binding to surfaces like on video.

  2. Put objects or bluprint actors from catalog like on video

  3. Calculete the cost of goods from the catalog (assigning a numerical value that will be stored in umg vidget)


PLEASE GIVE DIRECTIONS HOW CAN I CREATE THESE BLUPRITS AND CATALOG


In the end, it will probably be a house in bluprint actor, which I can move around the landscape, open doors, change materials, light the light. Houses can be selected from the catalog and placed on the site as a single object. In the house you can go in, arrange furniture there, the total cost will be calculated. The game will be saved on the server.