Several sentences

Temat przeniesiony do archwium.
Hi! Would anybody be so kind and help me with these sentences? I would be really grateful. I don't know why, but it seems to sound very strange. While reading this, I hava a feeling that I made plenty of mistakes.

Cytat:
I have begun my experience with the stock exchange about a year ago, making use of one virtual simulator. After several months I managed to increase the initial capital 2.6 times. Since that time I am investing only the real money on the stock exchange, making current profits of about 40% of the initial capital.
[...]
When I was fourteen, I was so delighted with the diversity of certain video game’s fantasy world, I came up with an idea of creating its encyclopaedia. After many months of work, I gathered over 140 A4 pages of all sorts of information. Nevertheless, it was still nothing in comparison with what I aimed to create. Then I realized it is not worth to exert myself for something that no one would appreciate. In spite of the fact that I had abandoned the idea of encyclopaedia, several years later I decided to publish all the materials in the Internet. The website is not yet finished, but I made some screenshots available.
[...]
I think it is worth to mention that I managed to get to the last but one stage of the all-Poland
astronomy contest, but not qualified to the final twenty.


Thanks in advance,
Flubber
edytowany przez Flubber: 15 kwi 2012
Please... Save my life :]
Cytat: Flubber
Cytat:
I have begun SIMPLE PAST my experience with the stock exchange about a year ago, making use of one virtual simulator. After several months I managed to increase the initial capital 2.6 times. Since that time I am PRES PERF CONT investing only the<-USUN real money on the stock exchange, making current profits AT about 40% of the initial capital.
[...]
When I was fourteen, I was so delighted with the diversity of A certain video game’s fantasy world, I came up with an idea of creating its encyclopaedia. After many months of work, I gathered over 140 A4 pages of all sorts of information. Nevertheless, it was still nothing in comparison with what I aimed to create. Then I realized it WAS not worth to exert GERUND myself for something that no one would appreciate. In spite of the fact that I had abandoned the idea of +GERUND AN encyclopaedia, several years later I decided to publish all the materials ON the Internet. The website is not yet finished, but I PRESENT PERFECT made some screenshots available.
[...]
I think it is worth to mention ZNOWU that I managed to get to the last but one stage of AN<-ODBIORCA NIE WIE, O KTORY KONKURS CHODZI, PRAWDA? all-Poland
astronomy contest, but not qualified to the final twenty.


Thanks in advance,
Flubber
Lifelong gratitude!

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