Omer, ahalan from Jerusalem. To be honest I'd say that with the decent live view system of your D700 just get a t/s lens and play a bit. The whole developing balagan together with the scanning annoyance, especially with a cheap solution, it's going to drive you mad. There is nowhere in Israel that does reliable film developing period, especially 4X5 or medium format. Even with an Epson 4880, the cheap scanning solution, you need to wet scan and be able to set the focus height to get good results (I never could get a flat scan with the epson holders).
I have a Cambo SC Large format camera in the UK (somewhere) that you're welcome to borrow it for as long as you like but I won't be able to bring it back here until at least the chagim and you will still need lenses, lens boards, a loupe, cable releases, a dark cloth, film holders, a film changing bag, a very sturdy tripod and head, etc. That's before you start learning to develop film (forget trying to learn to hand develop E-6 or C-41 from scratch out here) and learning scanning.
Kirk who really knows this stuff is right that learning movements is easier with a DSLR, I think in general, starting from scratch, you could be learning how to do movements with your DSLR tomorrow if you bought the lens and already learning from the results you are producing rather than all the time learning a new medium and camera system just to get to the learning movements stage.
If you're interested in playing without having to heavily invest can I recommend you to this website
http://mirex-adapter.de/ (you'll need to use Google translation). These are adaptors for incredibly cheap Mamiya or more expensive Hasselblad medium format lenses to put on your nikon camera and providing shift and tilt. Far cheaper than using the Nikon t/s lenses if you're just interested in experimenting. I have a the non tilt version of the mirex but I'm a canon user so I'm afraid I can't help you there.
There is another solution which will get me flamed from the traditionalists, using a good stitching program such as Autopano Pro you can shoot multiple frames and then correct the perspective in the program having enough resolution due to the stitching to not lose out by the perspective adjustments. Although you won't get tilt, you can, if you're careful, refocus between frames to ensure that the frames nearest to you are as in focus as the frames further away. I've shown these two photos plenty times here, both shot in the Rova (Old City of Jerusalem). Neither were possible with large format and believe me I tried. To get enough DOF with a lens long enough to maintain the 'look' I was going for was almost impossible, tilt/swing just wouldn't have worked at all here. These shots were taken and stitched with a 100mm lens and are sharp back to front with corrected perspective for a finished file with approx 35 megapixels of final resolution from a camera with the same resolution as yours. Neither took more than a minute to shoot or more than 20 minutes or so to process through the stitching program. Just a thought...
_