ok if you have mamewah you shouldnt need to manually type your command lines.
1- read your mame.ini file from with in your mame directory and setup your options and make sure all your directories are pointing to the right area.
2- launch mamewah, hit 2 and brings up your option menu, select emulator settings [1 is used to select stuff], then select emulator, and pick emulator 1, or whichever you like
3 - then under emulator settings choose execution settings, and point to you mame.exe so example c:\mame\mame.exe
4 - for send rom path select yes, send extension yes, long file names no, show dos window no
5 - go back to emulator settings, select list generation settings, for dat, nms, catver there all optional so you can skip them. set up your rom path, so probably c:\MAME\Roms\ then for rom filename extention choose zip [default]
6 - for list generation method choose rom folder vs listinfo.
7 - now go back to the main options screen select game list options, and then refresh game list. it should now show all your roms if everything is correct.
8 - to play one hit 1 or control and if all your mame settings are fine it will load right in.
its much easier loading through mamewah. if your still having trouble maybe try mame32 its easier to start off with. but if your using mamewah its not needed and mamewah has issues with mame32 at times so i recomend using mame32 on its own if you choose to.
other hint when in mame use the tab key to set up you controlls with in mame.
hope this helps.