BraddAn new is about 2 miles out of Douglas on the road from Douglas to Hospital (regular bus service),
Douglas is probably Douglas Borough Cemetery opposite groundstand on TT course on road between Douglas and Onchan (again regular bus route) - Castletown will most likely be Malew church yard a good but walkable distance outside of Castletown

(see for example www.manxnotebook.com/gazateer/gyards/cems.htm

check burials via www,imusuem.im but beware of a few funnies in the output as sometimes places Douglas St Georges in Onchan!