want to publish my site on web...help me please.....

Hello
You can register your domain name on godaddy.com. Usually they have low prices for .com and less than $1 for .info

Then you can get a free webhosting from freehostia.com. It will be enough for a starting site, you will have the time to let your site grow before starting to spend money into a professional web hosting service. You will just need to set the dns into your godaddy account;)

You don't need to pay to submit your site to search engines, there are many free service for that.
Just build your site according some SEO suggestions you can also find online for free. Otherwise it will be not indexed well.

The easiest way to be paid is paypal. In the beginning I guess is the best solution. When you will have a good traffic and lot of customers you will search for a better payment processor.

Wish this can help you.
Let me know if I can help you for anything.
Have a nice time there.
Happy earning to all of us.

btw if you check in my profile, the websalary site (the one with the orange banner) is done in this way, .info domain from godaddy, free hosting by freehostia. Feel free to check the site to evaluate the speed (most of the time required to open a page is because of google adsense)