i hate to say it, but there isnt a whole lot you can do with two 5 lb dumbbells... you dont have any access to a gym? or can afford a much more expensive set of adjustable dumbells "we're talking 100 dollars for those, BUT well worth every penny, cause you can adjust them to anywhere from 5 lbs each, up to 25 or 30 lbs each)
You OCULD do Body weight training, if you have no gym access, but the key to body weight training is PROGRESSION things l;ike pushups, pullups, lunges squats... the thing is though, you have to do LOTS of reps and that id really only good for improving muscluar endurace, not strength or building muscle.
So, if you cant go to a gym,, we need to evaluate what you CAN do.....
how many puchups can you do? (real, not from your knees, or if only from knees, how many?) How long can you hold a plank, and a side plank? How many Body weight squats can you do, and are you using good form (sit back on heels, butt lower than knees, pushup down and OUT-=like youre pulling the carpet apart whith your feet-- when you go up. If you cant do a pulluo, how long can you HANG from a par? can you do a negative pullup? JUmp up and SLOWLY lower yourself... and what about singlelegged exercises? Like lunges, and sinlge-legged squats (this is where some progression can also come from) How many tricep dips can you do off of a chair? basically im looking for a baseline of fitness to give you some progression ideas with Body weight strength training..... If going to train at home, a pullup bar is a MUST (10-15 bux from walmart, can mount in dorr frame) and there is SO MUCH you can do off of it..... Also, if you cant afford adjustable dumbbells, look into both resistance bands, AND getting one or 2 pairs of heavy weights (for leg exercises) like 15-30 lbs or a couple kettle bells that go higher..... but i still think an adjustable set would be beast. ALot can be done with bands though.
So, give me a little feedback, and ill halp you out