French tarragon does not set seed, it is propagated by division, so you can't get French tarragon seeds. If you live in Wellington you might be able to buy fresh French tarragon leaves in season from...
umm you can buy it at toys r us :)
Quite simply, chicken. Especially in a creamy pasta. Enjoy!
You can use anise seed or fennel leaves.
No, they're completely different herbs.