To add a pushpin on the map, there's a function called "AddPushpin". All you need is a location object, like the one you get from the Findresults-Collection.
The help file VB reference is very useful.
First you'll have to search for an address, then you pick one from the findresults-collection, then add the item as pushpin and then make a zoom and that's it

Of course you can change the symbol of the pushpin and add some text to the pushpin.note and show it.
Perhaps you can make a search for mappoint.hlp -> there is also some good advice in it. I still find a lot of things I can put into my application.

I'm looking forward to Mappoint 2005 - I hope there's a lot more cool stuff in it then
Greetings from Germany,
Syd