09 ignition switch confusion

[Mltoys]

Since the car does the dredded intermittent starts when turning the key i am getting ready to replace ignition.

now i looked online and there is an ignition switch called out and theres a seperate tumbler, really ?

which do i need to change ? Also i have the keyless entry remote which is part of key, with no alarm so what do i do about those ?

thank you