You only require the following items to create a texture or resource pack add-on for the Bedrock edition:

• Minecraft Bedrock (Xbox Gamepass edition also counts)
• Zip file extractor like Windows Explorer
• Basic image editor like MS Paint (use GiMP, Paint 3D or Photoshop if you want to add transparency)
• Text editor like Notepad
• Vanilla resource pack

Unlike the Java edition, you can’t extract the texture files from within the game. So, you have to separately download the vanilla resource pack using this link.