Where can I get good quality materials and topic sources from?
This is just a forum, if nothing comes your mind, you can just continue to learn from other discussions and see what others are posting and you too can contribute. Topic should not be an issue, you do not necessarily have to create a topic, let it happen naturally if need be to create one.
Yeah man, i feel thats the best way to go about your topic creation problem. @op, the forum is not a competition ground for the most topic created, you are not competing with anyone and i feel the reasons for you not knowing what to post is because you have not read enough. Try doing more reading and maybe contributing in other people's thread and just join in the conversation and before you know it you have learnt alot more than trying to crack your brains into creating topics that would draw attentions. I personally believe that you cant offer what you don't know so i will advise you to just keep reading and the knowledge of writing will come naturally.