Welcome to SolidWorks forums DD.
Check here for tutorial: http://www.solidworks.in/sw/resources/solidworks-tutorials.htm
Also you can refer to machine design book and can create 3d model from the 2d drawings given in them.
You might also find this post helpful for your future reference.
Just select an everyday item from around you. A chair, lamp, cup, speaker, bottle, saucepan, screwdriver, or whatever, then measure & create.
Do you have a local SolidWorks User Group? Go to a meeting and ask this question in the geneal discussion. Someone will probably come up with some stuff you could work on.