Well, you started well with capitalizing your sentences. Keep that up, for sure.
And if you've got grammar issues that need immediate attention, then I'd suggest Googling "grammar check" or something - there are things out there, but to be honest they're not very good. However, if you're looking for a way to actually grow intellectually and as a writer, all I can say is to read literature. Great readers become great writers... That's really all there is to it. As you read from different authors, you can draw from their styles of writing, from structure to content, and you begin to develop your own.
Good luck
