Sit-ups, push ups, some basements have beams where you can maybe do some pull-ups.
Try filling some empty milk jugs with water and using those to do some upright rows, lateral arm raises, front arm raises.
You can start with things like these, but eventually if you want to see some serious gains, you're going to want to get some basic equipment.
I assume you live at home and don't have a job since you're 14. Can't your parents help you out? Dumbells are pretty cheap when you're first starting out.
As far as giving you a routine without you having anything to work with, like I mentioned above. Sit-ups, Push ups, heck, try benching your younger sister
Really though, find a way to at least get some Dumbells. You can do so much more with them.