There are a few tasks to complete before you see Handy smurf talking about blueprint. The task will take a few days but its quicker with smurfberries.
Thereafter, look for the blinking cursor around your Handy’s workshop. Follow the instructions thoroughly then you can get your Handy’s Shop Soooonn:
Once you have completed the task re Handy Customisation, papa smurf will mention about new island. Again, follow the instruction, tap on the yatch…sail to the new island: