I need make a shortcut that will be adding certain text at the cursor, eg {sometext}, how can this be done?
If you already have a snippet file written, say at Packages/User/myFunction.sublime-snippet, you can use
Add this to Preferences > Key Bindings - User
{ "keys": ["ctrl+1"], "command": "insert_snippet", "args": {"name": "Packages/User/myFunction.sublime-snippet"} }
This example binds the snippet to CTRL + 1.
I found the info on Christopher Millward's blog.