Trying to understand using certificate for public /private key for encryption

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VB

I am new to this technology, I am trying to understand and implement public/private key encryption. Doing lot of surfing on this and got stuck in no man's land.

Clarification to my following question will help me understand better.

1) I used makecert to create a self signed certification with private key and got installed in my store

2) used makecert to create another ceritificate signed using the above certification.


3) Now I am able to encrypt / decrypt using the certification created in my step two, but what is the use of the certification created in my step one then in the encrypt/decrypt process.

4)My simple requirement is use public key to encrypt a file and decrypt using the private key[Asymmetric ], with signed option. Will be great if some one can provide me with simple and details step to achieve this.

Also, when and how to use the private certification/public certification.


Thanks you..