Need some travel advice for Feb-April in Wijgmaal Belgium! PLZ

I've never been to Europe & am a Southern California weather nancy!
I'm worried that I'm going to be so so cold & unprepared.
Also need help for international cell service...my provider is verizon.
Could I expect to use Wifi?

I'm meeting my father & extended family (for the first time) who live in Wijgmaal.
Anyone know anything about that town?

Asked by Monet Pedrazzini via WorldNomads.com