Marie-P, I'm doing the same thing -- looking for a DTP software package. See "Does anyone use Linux for DTP" thread.
I have found three packages:
1. Scribus -- the most found during a search, but not quite fully developed. It is functional for most uses as is, and can be used for most page layout. It appears to have everything I really need for my little magazine (
http://farna.home.att.net/AMC.html) though. I hesitate to switch to it because support is spotty and there is supposed to be a format change "soon". May have already occurred, I haven't checked in a couple months.
2. Xclamation -- Run an Intenret search and you'll find this. I haven't had time to try it yet, but it appears to be fully functional. Not sure if a cost is involved, but I couldn't find any mention of a price on the web site. Might be in the downloaded package, haven't downloaded yet.
3. PageStream -- Search! PageStream is a mature package that was the star of DTP on the Atari ST and has been ported to several platforms, including Linux (and Windows). It's a commercial package, not open source or free. Fully supported and well documented though. I've downloaded it and performed a cursory look, and it appears to be very similar to PageMaker 6, which I use now (later "upgrades" to PM were a joke, transitional packages to InDesign, which is too cumbersome). Cost is a reasonable $99 for the main program to $150 for a package with a lot of extras.
I don't mind paying a reasonable price for fully documented and supported software -- I'm leaning toward PageStream myself simply because of maturity and support. It may be a while before I can fully switch to Linux, mainly because it takes little time to produce my magazine using a template in PM6, but I'll have to do it all from scratch in another program. Won't be too time consuming, but the magazine is a hobby, family and my "real work" come first!!
PS - Here's the best unbiased review I've found of PageStream:
http://www.itreviews.co.uk/software/s300.htm