finding a rare item with the exact stats that you want requires tons of luck at such an early stage of the game , therefore you can roll magic items (the blue ones) with oils of renewal untill they spawn with the stat you need . in your case , you will roll a rare helm (or circlet) untill you get the oskill , depending on your luck it can take some time untill you get the good roll . the helm must have high ilvl in order for Meteor shower to spawn (up to +21 to Meteor shower - more points for it = more damage , so if your first roll is let's say "+15 ", you should keep rolling untill you get something close to +21) .
in order to have a high enough ilvl asap (in case you don't find one very quick) , you can also do this : get a high tier helm (t4 to t6 , the highest you can wear - a t6 leather helm - cap -is enough -> the base defense is not important , so you need the one that requires as less stats as possible to equip so that you don't waste precious atributes to dump into str or dex instead of puting them to energy for more damage ) , transform it into unique (2 arcanes + oil of enchantment) -> affix burn it (catalyst of destruction + rune) -> use oil of enchantment to make it magic . then start rolling the magic item with oils of renewal untill you get the oskill you need
Suffix +(13 to 21) to Meteor Shower min. req lvl 40 Helms / Circlets