How do I restore sql server database primary data back .mdf

Hello guys

My server crashed  but luckily  I was not able to get back my files with help of recovery software.

Now, all I have from the database are just sql server database primary data .mdf and sql server databaseTransaction Log Files .ldf. I need to restore  these data back to sql server.

Please could someone tell me how to restore these two file types back to my sql sever 2007 database?

Thanks

netboy