Balaji,
lotus notes is a proprietary system.
1. First you need download Domino server (180 MB download)
2. Then you have to learn how it works (1 day to get it running)
3. Then you have to download Domino Designer (100 MB)
4. Then you have to learn how to develop Domino Apps. (3 days to get something running)
5. Then you have to learn how to get a decent design which looks like web and not like Domino(2 years or come to germany and visit the course, I have written for my company
).
6. Search a provider.
OR: GO PHP...