It depends on where you wanna go from there. If you wanna model something new, do as Matt suggests (the Joan of Ark tut can be found in english at 3dtotal.com, and I think there's a link to the french version there if you prefer that), altough both those tuts are on organic modelling, they should provide you with some basic skills and knowledge...

If you wanna work some more on your spaceship, I'd suggest starting to texture it. I'm not sure if there are any free tuts on UV mapping here, but I've been told that Mike's tut (www.mtmckinley.net) is really good...

Go for it, and remember to post your work in the WIP forum