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If the SD card is over 2 GB you probably just need to update hiyaCFW to fix that error. Or if you hold A + B while booting that should take you to the Unlaunch filemenu*, from there you can go to OPTIONS and set NO BUTTON to Launcher and it'll boot to the normal DSi Menu.
Another thing worth noting is that TWiLight Menu++ updates a lot and has improved a lot over the years, so you may want to try updating it and see if you like the new version more. Depending on how outdated you were it may be a big improvement. There are also various skins you can use (or make your own) to change the look.
Once you've got everything set up and working, you may also want to make a backup of the SD / microSD card in the DSi and then update the version of Twilight Menu using the official development sources. There's a ton of improvements in newer versions, including better game compatibility and more features, and your old owner likely hasn't updated in a while. This is also how you add games onto or take them off of the DSi - just copy them to the correct folder on the SD card from a computer. It's been a while since I've looked at mine, but I believe it's roms -> the type of console (for plain Nintendo DS games for example, it's "nds").