1) If you are refering to the +r /-r standard: Surely not. But it depends on your writer. Most writers should have no problem with +r or -r. Most DVDs are DVD9, i.e. they have to be compressed to fit on a DVD+R/-R. You may use a DL (i.e. a 8.5GB disc) or split the movie.
2) I am not sure, whether I got the question correctly. If you are using the "Clone DVD" option you should be prompted to insert a disc into your writer automatically an the burn process will be started.
3) Yes. Make sure you ticked the option tp preserve menus. If you decided to cut some things, selecting some menu items will just do nothing in the final disc.