Congrats on not spending money
Yes do evaluate, but also relax, Bilingual kids tend to take longer to start talking but when the do talk they speak both languages. Number one thing to find out is if he can communicate with you..do you know what he wants?
As to specific games..try teaching him simple signs (thank you, more, please. out, shoes, walk-borrow a library book or look up online, or make them up, just be consistant)
Color..name the colors you use/he asks for
Babble...you want him to do it so do it...bababababa or lalalala, pick a letter a day and use it every time you mess with your hair, or wash your hands whatever else you do in a day a lot. (speaking of washing hands, start singing a song when you do with him...any song, just sing)
Animal sounds, get a book point out the name of the animal, then make the sound, ask him to, but don't push. (feel free to name it in English and Spanish, or just one)
When you play with blocks/other toys, spend an extra second naming each toy, do it multiple ways (red block, this is a red block, I have a red block, I will put the red block on top, red block)
So long as you never stop talking he is getting the single most important element for a child to learn to talk...the TV doesn't count IMO.
My oldest two talked early, my third was average, but seemed to take so long, well now I can't shut him up, so I am not to unhappy that my 4th is taking her time