Digital BW, The Print

I am interested in starting to  print some b&w on the 1800
printer.I've read/re-read most of the info i could find,and I'm still
not quite sure exactly what step to take first..
On the inksupply .com website ,it says"that oem epson ink is
compatible with the black inks from MIS",and that no cleaning is
necessary.
Then on another page it states that cleaning is mandatory.

1.do I need to remove all of the oem inks,and purge the printer of oem
ink,first?

2..After purging the ink,do I put the oem color catridges back in the
printer ,or leave  them out?

3. Do I print with the 3 black cartridges only?

 Any advise /help would be appreciated
Thanks for your patience
Mike