android custom launcher and app modification

We have a app that has a splash screen, after which there is authorization done based on wifi mac and user id/pwd then a app links screen (kind of like a launcher it downloads the config file from a webserver to see what apps to show) and clicking on the links will lauch what ever app need to be run, and on home or return key will go back to this page. what we want to do is 1- make a launcher to replace the current UI it will still display apps based on the config file and also will need to authorize against a web query before showing apps page , change the current app to use eth0 mac instread of wifi, and eliminate the need for user id/pwd. also want to change the settings tab so can change network or wifi settings thru this UI rather than using the settings app. do need this asap. if you have prior experience with launchers is a plus