I have a friend whose son is crazy about tennis and she wants a tennis court for his birthday but I'm not sure what will hold up for a net. Plus I was wondering how hard it is to make the little people out of fondant. Any suggestions, ideas , and/or instructions would be great. Thanks!

Either fine net from royal icing - pipe it on paper, let it dry, take off the paper. Make 2 or 3 in case of breaking.
Or take clay extruder, make fine ropes from fondant, lay it as net, let it dry. Again, I would make 2 of them.

I agree...I would use royal icing and do a couple of back ups. Making people out of fondant isn't too hard...I just made a Hello Kitty for my daughter's birthday cake. Check out several different photos and just have fun with it!

I suggest cutting up a course hairnet and attaching it to wooden skewers for the tennis court net. Making little people out of fondant is in the Wilton 'Celebrate With Fondant' Book.

If you need online tutorial, here are some.
For polymer clay (and fairy)but you get an idea
http://www.polymerclaycentral.com/pcc/suefairy.html

Different approach and from Czech pages but pictures only:
http://www.dortydortikydorticky.estranky.cz/fotoalbum/modelovani/bart-simpson
http://www.dortydortikydorticky.estranky.cz/fotoalbum/modelovani/muzikant

I did a tennis cake. For the net, I glued a rectangle of tulle (sp?) from the fabric dept. onto two lollipop sticks.

You can't really see the net in the picture but here it is....
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1152904