Widgets are not available with BlackBerry OS 5 (Which is the latest your device can run), and not with BlackBerry 6 either.
For your feed although you can try an app such as
SocialScope - A Mobile Inbox for your Social Networks
It is in private beta just now though yet you can sign up.
For weather you can try an app I personally recommend such as
Bellshare - BerryWeather.