Hi welcome to OSM Mahsa,
well first you should discover our data model, data formats and so on.
http://wiki.openstreetmap.org/wiki/Develop
Next you should specify the goals of your application, so you want to
write a logger or a router etc....
You might get inspiration/code snippets by other software that is
similar to your plans
http://wiki.openstreetmap.org/wiki/Software
The following steps as inventing a good data model, OSM data import, ...
rely on the decision you took one step before and are very close to the
goal of your tool.
For details I would recommend the DEV talk list
bye
Matthias
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