Read my English composition. How can I improve?!

Read my English composition. How can I improve?

Hello!
My last rock concert
I love rock concert! I´ve already seen many live bands and I also have a band and sometimes I play for some pubs or rock fest. My best rock concert was in Vancouver when I went to the Metallica concert. It was an amazing performanced. I am from Brazil and I live in São Paulo, here there are many concert band...my last concert was Motorhead in April. Great show!! by the way, I am bass guitar for a Motörhead cover.......this is a great job to play songs for Motorhead!!! Yeah.....Last Saturday I had a "gig" for a rock fest in Downtown. That show just was regular presentation!!! Unfortunately the stage equipament was terrible!!.....but it´s ok.....We rock anyway...hehehe...." ACE OF SPADES".....
My next presentation will be in August, I hope the song equipament work better than the last one.
And the next famous concert, I am going to see in September When Marilyn Manson will be here in São Paulo. I´ve already bought my ticket..Rock on.

I made some grammatical changes...

My last rock concert
I love rock concerts! I´ve already seen many bands live and I also have a band of my own. Sometimes we play for pubs and rock festivals. The best concert I have been to was Metallica in Vancouver. It was an amazing performance. I am from São Paulo, Brazil. There are many great rock concerts here, my last one was Motorhead in April. Great show!! In fact, I am bass guitarist for a Motörhead cover band, it is an honor to play songs by Motorhead!!! Last Saturday I had a "gig" for a rock fest downtown. Unfortunately the stage equipment was terrible!! But it´s ok, we rocked anyway...hehehe...." ACE OF SPADES".....(?) My next presentation will be in August, and I hope the sound equipment will work better than the last one. The next concert I am going to is Marilyn Manson here in Sao Paulo. I´ve already bought my ticket..Rock on.