Rather than create a deck from scratch, you can download a already-made deck from sites like deckstats.net
After you find the deck you want, click on "Tools" and select "Decklist" (or you can select "download" to pull down a txt file with the same info).
Frogtown is looking for QTYspaceNAMEOFCARD. Unfortunately, the deckstats decklist includes some square brackets and letters between the quantity and the name of the card.
Paste decklist into notepad++, and do a find-and-replace (with the "regular expression" radio button selected), and search for:
\[.*\]
Replace with nothing
BOOM. Ready for frogtown
TXT version of lists of cards
My Decks > New Deck
Actions > Bulk Import
Actions > Change Name
Add variety to the lands the little purple icon and the left panel
Actions > Export to Tabletop Simulator
Actions > Download json file
Copy to
%userprofile%\Documents\My Games\Tabletop Simulator\Saves\Saved Objects
In TTS look under Saved Objects after being promoted in a game.