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@Rik_Van_Looy
If you want to keep your existing rear mech you'll need to check its capacity.
(The ability of the derailleur arm to take up slack in the chain) - assume for sake of argument 30T
you then take your chainset range in this case 14T, subtract that from your capacity and you've got a rear cassette range of 16T e.g. 12-28
if you want a top end of 32, that'll mean a cassette of range 16-32 (which you'll be unlikely to find off-the-shelf.
Alternatively you can make a mental note never to go into the big sprockets when in the big ring!!! - but that's rather risky