One thing that will be limiting your motivation is how much you actually like coding if you truly do like it I'm sure you can be competent as to what is happening on your rails site in your time frame but if you absolutely loath programming the goal may be a hard one to reach.
For ruby you probably could do well starting off with Why's (Poignant) Guide to Ruby http://mislav.uniqpath.com/poignant-guide/ and maybe buy pragprog's ruby book, programming ruby, or the ruby way and move up from there
Just remember to try and change the code yourself, you have to interact more than read the books
Comments
One thing that will be limiting your motivation is how much you actually like coding if you truly do like it I'm sure you can be competent as to what is happening on your rails site in your time frame but if you absolutely loath programming the goal may be a hard one to reach.
For ruby you probably could do well starting off with Why's (Poignant) Guide to Ruby http://mislav.uniqpath.com/poignant-guide/ and maybe buy pragprog's ruby book, programming ruby, or the ruby way and move up from there
Just remember to try and change the code yourself, you have to interact more than read the books