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Self voting is definitely more profitable than curation. There's no doubt about it. But it's selfish. Steemit only operates properly if we spend our voting power on each other instead of on ourselves.

I we upvote over coments..
Than what it happen..
Any upvote power give or not..??
Either if u vote me than power increase..

I'm not sure I understand you, but I'll try to answer: As your Steem Power increases, so does the value of your vote. But you have a limited amount of voting power you can use each day. The more you vote, the more you "drain" that power, and the less valuable your vote becomes until it recharges.

For now, you should focus on created good content. Hopefully people will upvote you and their upvotes will increase your Steem Power.