General

if your using nx then invest in the 90 day permit.
With 200 mill try and buy cs 10% for a cheaper price (in my world i would consider cheap 27 or 28 mill and i sell them for 33 but most sell for 35 to 40)
Or buy tons of spell traces and buy dim gloves, or use the ones you have, for cheap and scroll dhem. Dhen profit.
Worst case you break even, if they are average scrolled then you should profit by a little, nicely scrolled then thats like 30 mill profit

Eh, I personally wouldn't buy a store if you don't really have anything to sell. I mean, yeah, it's free, but you can only buy 2 a month. But things like boss drops would be decent money. Condensed power crystal, golden clover belt, royal black metal shoulder, crystal ventus badge, etc. And if you're able to do gollux and commerci trade voyage sell those accessories too.

All I do is sell all cures when I buy those free stores. Not much but it adds up when you sell in bulks.

Dont buy the store buy a 90 permit. You need the time to learn what to do.