you cant really make your portfolio without work (i know its a catch-22). you need to go out to open calls for models and take any opportunity (paid OR unpaid) you can. when i first started modeling, i also did runway makeup, so i was able to do professional shoots using myself as a model, and for that i was very lucky. that said, i also went out to open calls, and modeled often for my friends who were photographers. my portfolio was modest when i got signed, but i guess it was enough. you need to be photogenic, have a unique look, be at least 5'9 (thats for women, men definitely need to be taller) and you have to really engage the agent in the go-see. im 5'10 and i actually got a comment once about being a "tad to short" for a particular runway show, so you never know what certain clients are looking for. as an actor, you need to build a resume, and professional headshots, which cost a fortune, but if you can find student photographers or friends who are apt at it, you will be able to get decent photos for very little. again, just get out to as many open calls as possible, and audition for all non-equity shows in the community to get your resume started.