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It is not clear how much you understand.
As mentioned above, follow what it says here.
http://forum.tinycorelinux.net/index.php?topic=2325.0Don't expect it to be straightforward. If you are able to get it working, you may need to use some dependencies from tinycore and some dependencies from debian. You will need to manually sort out dependencies.
Is there a particular app you want to install?
Do you want to install a lot of debian apps?
What are you trying to achieve?
You may need to experiment to see what works.
If you don't understand what you are doing, you may find it too difficult.
If you do get it working well, there is an opportunity to make a new distro based on the tinycore concepts, with the ability to install debian (or another distro's) apps.