Well for me u have to have a website setup to load your patchs to like

. But u have to execute the .sql file then import the .sdata file back into the client. using LPHs tool------>

then make your patch and upload it to your website and if did correctly u should get a update with your updater.
And on your second question i guess i am not to sure. If u choose the right grade to have a certain mob drop make sure to restart your server to have it take effect. Usually works for me cause i have yet to have that problem. Someone might know a bit more on it but that usually works for me.