from the command prompt do the following

cd C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\BIN\

stsadm -o addsolution -filename c:\solutions\MyContentWebpart.wsp
stsadm -o deploysolution -name MyContentWebpart.wsp -url http://sharepointdev/
stsadm -o installfeature -filename MyContentWebpart_Feature1\feature.xml
stsadm -o activatefeature -id 328f5be7-14cf-4c7c-a39d-7b068920e11b -url http://sharepointdev/ -force

The webpat is now ready and can be put on your webpage.