oohh paa gee black very difficult colour to maintain :P, if ur car would be daily driven car and u dont have passion for detailing than must choice anyother col like medium grey etc
i am not sure about ur budget so giving u 2 detailing packages for black
option a
1) armorall shampoo roughly rs200
2) micro fiber cloth min 2 ( rs250 each )
3) turtle wax ( green jar ) rs450
in turtle they have blue and green jar , blue is for metalic colours and green for soild colours, toyota black is solid col without metalic
4) turtle ice synthetic wax ( rs 1300 )
wash car with shampoo and dry up with microfiber, apply turtle wax green jar , very thin application dont use thick layer as it would difficult for you to take off
than top up turtle ice synthetic
green jar wax give depthness in paint colour while ice wax works like sealent , dont attract dust and give good reflections.
option 2
item # 1 and 2 same as above
3) meguire's gold class ( roughly rs 2000)
4) meguire's nxt ( roughly rs 2200 to 2300 )
wash car with shampoo and dry up with microfiber, apply gold class wax , very thin application than top upwith nxt its synthetic wax
gold class wax give depthnessand colour darkening in paint colour while nxt wax works like sealent , dont attract dust and give good mirror like reflections.
never do dry dusting it will creat swrils and secratches on car skin 
many more options but that costs more
