Using the Steam Market with a new account

This seems to be implying you have multiple accounts, which is against the TOS. So you should probably think about it.

Y U NO READ ?

Won't work. You have to buy an item from the Mann Store. Community market purchases won't make the accounts premium.

You need to have a purchase in your account before you can use the market. If you meet that requirement, and have had steamguard enabled for at least 15 days, you can do it.

It seems like I have to put 5€ on every account, buy 2 keys (4€) and get a fortix for you guys :D