You may REALLY wanna lower your expectations. Yes is possile to run DS roms with CFW alone, but at the moment, you are better off with cheap flash cart like r4 (i would suggest dstwo for personal reasons) But you can be waiting a long time for current improvements. Not all ds games work and only a handful does, and none of them have save support, so in the end playing is probably a waste until save is supported, unless you one of those people who don't mind starting over every time like nes games, or a game has password or something... or i guess you speed run games for a living like mega man or something. But is possible and very limited.
Load times are bad, up to 2 minutes just to boot, and every load sequence is like poor. Just playing mega man zx, is about 2 minutes to boot to main menu, 2 minutes to get to game start, then text scrolling.... a FMV cutscene which studders every secoond extending a 2 minute video to about 5 minutes and then you actually get to play. Every time you pause to open menu, 10 second delay, and not to mention, walking around from room to room, and other stuff. Is like playing a very old early CD based game like turbo duo, sega cd, playstation, phillips cdi, panisonic 3d0 or neo geo cd, or even First gen psp released 2005 Phat 1000 series model without the extra ram boost.
At least wait until save feature is added or load times is improved, or buy a cheap flash cart for less than $20