If you downloaded and installed R4 kernel v1.10, then you don't have to do anything about DLDI: v1.10 has a DLDI autopatching feature. The first time you run a ROM on your R4, it will automatically be patched with the R4 DLDI driver. As for recommendations, I'd say for emulators you should get SNEmulDS (SNES emulator), DSMasterPlus (SMS/GG emulator), PicoDriveDS (Genesis emulator), and nesDS (NES emulator). Some good homebrew games and apps include Warcraft: Tower Defense, DSOrganize, QuakeDS, MegaETK, and Tales of Dagur.