Why don't you just use a UI or frontend to figure out what the exact ROMs you are missing. Right click the game and click Audit. It will tell you exactly which files you are missing. And then once you find those missing files, you can go back to using the commandline MAME if you dislike the UI version. Try using MAMEUIFX, it's my favorite MAME derivative. If you'd rather try a front end, try QMC2. Once you get used to MAME and are comfortable with it, then you can try fancy, eye candy front ends like Hyper Spin, Emuloader, GameEX.
You should do some research for which derivative or frontend that suites your best needs... compare and contrast them and choose whatever tickles your pickle. But for a beginner like yourself, I'd definitely recommend you not using the official commandline MAME because you aren't knowledgeable enough yet to configure it. If you use MAMEUIFX or MAMEUI, it's easier for you to understand and figure out how to configure it.