Which vaccinations will I need after splenectomy?

Three main and flu. Three main vaccines apply significantly for people with surgical or functional (sickle cell, etc) asplenia. Haemophilus, pneuomoccus and menigococcal vaccines. Each should be given 14 days before splenectomy if possible, and if not at least 14 after surgery. You should also get the flu shot yearly as well.
Pneumococcus +. Immunization against streptococcus pneumoniae is most important. Haemophilus influenzae and neisseria meningitidis vaccines are also used.
3 of them. Vaccinations needed include haemophilus influenza (h flu) vaccine (this is not the yearly flu vaccine) and the meningovax. Each of these are needed once. The 3rd vaccine is called polyvalent pneumovac vaccine and it should be administered every 5 - 6 years.