Inbox Assistant should be under the Tools menu (I haven't seen a recent Outlook version - it could have moved - use Help to find it). Click Add Rule. Put the good name in the 'from' box and check 'Move to'. The Folder button will become active, click it and select Inbox from the list. Add a rule for all those senders you are prepared to accept. When you've done that, add a final rule - check All Messages (was top right), then Delete Off Server.
The Help should walk you through the process.
(Should probably just do one for your own name first, then send yourself an eMail to make sure it gets through.)