I dont know more about "Scientific workplace" but MS Word is fine for writing. One more thing before start the writing need to collect materials about your topic.
One FREE and simple program I use for keeping track of research-related papers is EverNote (www.evernote.com). You can store practically anything in EverNote, from webpages to pdfs. You can even use your computer's webcam to take pictures of something (e.g., a written note) and file it away. EverNote has a search feature so you can search by tags, author name, or even individual words; it's never failed to find what I'm looking for.
The best part of EverNote is that it backs up your data ONLINE, so it's accessible from any computer. So, if you're at school and don't have your laptop handy but need to find a particular paper, you can log onto EverNote's website and get it.