I don't want to discourage you or sound negative and pessimistic, but it is considerably more difficult to learn from scratch at such an age. I speak from experience when I say this.
My parents forced me into piano lessons when I was 10 and even against my will I was playing Beethoven sonatas and Bach fugues by age 13. I stopped playing almost completely when I went to the university at age 17 and it wasn't until age 24 that I developed a serious interest to play again. I'm now 26 and I'm still relearning what I knew back then and I find it hard to learn and memorize new pieces now.
Playing the piano, or any instrument for that matter, is like learning a language, I believe. The younger you are, the easier it is. I noticed this when I taught begginer piano to 4 and 5 yearl olds. I'm not sayin that it's impossible, but it won't be as easy as it would've been for you at a younger age.
Also, GET YOURSELF A TEACHER. If for even 6 months. A teacher is essential to learn how to read, to phrase, and to interpret music. A teacher will also exemplify your mistakes and will know what you need to concentrate on. Make sure you find a serious teacher, one that concentrates your first weeks on theory, technique, and other basics like scales and arpeggios. DO NOT GET A TEACHER THAT WILL JUST TEACH YOU PIECES! You won't learn much if you only learn one song here and another one there.
As for keyboard, try to get one with weighted keys. That's essential to build up your stamina and finger strength. When I started playing again 2 years ago I made the mistake of buying a keyboard with light keys and now that I upgraded to a digital piano with weighted keys I'm having difficulty getting through some compositions because my arms and fingers get tired.
I don't know what model to recommend you but whatever keyboard you buy, make sure that it's at least 4 octaves in length. If you don't know what an octave is then count all the keys, white and black, and make sure that there are at least 48.
Learning on your own is not impossible, but you need guidance. You can't start off by reading Shakespeare but you also can't read Dr. Seuss for ever. A teacher will know when you're ready for new things.
I wish you the best of luck and patience.