Memorizing Vocabulary

I have been studying Spanish for several months now. I have an on-line teacher, I use DuoLingo, have started using italki to find a community partner to talk with, and I have been using my Spanish as much as possible when interacting with Spanish speaking people. I do something on a daily basis. But I feel like I am not remembering what I learn very well. Does anyone have tips for helping the information to "stick"? Do you use memorization techniques, journals, etc to help retain the information? Thank you. Carla