questions

How do I put buildings in the map. i dont see any on the left screen. And how do yo connect maps.

You need to choose a tileset that contains buildings.  Try from about 009-CastleTown and about every second one from there until about 028 contains outsides of buildings.  The alternate ones contain the inside contents.

You connect maps by using events.  In the spot where you want to trigger a transfer to the next map, double-click to add an event, then on the second tab choose Transfer Player.  Click the arrow next to the transfer to coordinates and you can choose the map and the spot you want them to move to.

well had do you add the tile set to the left screen,and how do enter buildings.

At the bottom on the left, all your maps are listed.  Right-click the one you want to change, and from the window that pops up you can change the size and the tileset, as well as a few others.  Just drop down the list and select from there.

If you want to see what tilesets are available, go to Tools on the menu and select Database.  Click on the Tilesets tab, and you can scroll through them all and see what each one contains.  Just be careful not to click on any of them 'cause you don't want to accidentally change any of the settings.  Make a note of the one you like, then go into your map properties and select it from there.

Now - to enter buildings... some buildings have doors as part of the tileset, and some don't.  If they don't, you have to use an event to add the door image.  To go from outside into a building, you have to put an event on the door - set it to either Action Button or Player Touch (the first if you want them to have to press space or enter to go in, the second if you want them to transfer just by walking into it), and add a Transfer Player command - just like you do to go from one map to another.  You've got to have your inside map done up though, so you can say where you want to transfer to.

Hope this helps.  If you haven't seen them already, there are a few good tutorials to walk you through creating buildings - both outside and inside.