BTC were then purchased with a small amount of cash from a bank account on a website I dont remember & then transferred to the wallet. All this happened within a few months of the "infamous pizza" story first making the news so it's 100% all happening in 2010.
Imho you should think it over again and find better clues about the year, since I don't think that you'll find any wallet in 2010 that was handling words (no matter if seed or brain wallet). All that came later.
And if your story is inaccurate you will get answers on BIP39 and such.
Also, after clearing up what year was it, maybe you remember what wallet you've used; it could be of real help. If it's indeed words-based and local (so I'll cross out blockchain.info), Multibit and Electrum would be the main options, but both came at the end of 2011. I think that only Bitcoin Core was there in 2010 and it had no seed words.
Without better info, the answer to your BIG question is "you don't". Sorry.
Confident words I choose were PGP key related. Done a bit more reading today & now Gnupgp is dinging bells. Problem is I looked at everything at the time. Found the whole principal of digital currency fascinating & had more time than you can poke a stick at to dive down the rabbit hole.