If that's a 1:1 clone like it appears to be, then you made a good choice. You won't be able to use an SD card larger than 2 GB, but the Wood R4 firmware makes it a pretty decent cart. I used an R4 with Wood before getting my DSTWO, and it served me well for a few months. I needed to find a patch for a few games, but most will already work thanks to Wood's regular updates.
To put the firmware on the card, just search for Wood on Filetrip, then drag and drop everything in the archive to the root of the SD card.