I think most people do glue the stem and base.
If you're worried about storage and transport and that flimsy base breaking off (which happens far too often) you can try a magnetised version, with the magnet in the model and one glued at the top of the stem. It's not great and a bit tricky, but my friends entire jetbike army is this way. He used flat round magnets somewhere around 5mm. I avoid the stem, and like to model a base out of the clear plastic (for size and stability) with a wire or such attachment for jetbikes, then hide the wire in a bit of scenery, a plant or rock or whatever. I actually can't stand the clear plastic flying base material for my larger models like land speeders etc. I replace the stem with a long and narrow bolt in the base and a nut glued inside the model, then model a cool base to hold the bolt. It gives me a chance to make a little theme piece, as well as make the hold stronger. Unscrew it, store it and I'm golden. I do admit the bolt is hard to hide etc...but I'm not the greatest painter anyway. I have a couple of land speeders done this way on my edwardmystcreations.weebly page in the space leopards. I think this link will work.
http://edwardmystcreations.weebly.com/space-leopards-landspeeders.html
Anyway, welcome back and hope you have a great time with the army!