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In short: Buy something from the Steam Store (any price), wait 30 days.
And yes, you have to buy something from the Steam Store and then wait 30 days to use the Market.
https://support.steampowered.com/kb_article.php?ref=6088-UDXM-7214
Purchasing funds counts only if it's done here: https://store.steampowered.com/steamaccount/addfunds/
THEREFORE, what gwait says is correct.
Market wants a purchase. A gift card redemption isn't a purchase.
The only thing that matters is that you have a purchase, and that it's older than 30 days; less than 365 days old.
Currently cheapest game:
http://store.steampowered.com/app/446640/
If you acquire its trading cards and sell them on the Steam Community Market in 30 days once you've got access, you should make up for most of its cost, if you want.