Loomis is alright. However, I can look at a Loomis book and only get so much from it. You have to time? Make some. You have no money? Pencil cost 20 cents, paper cost $2 for 100 pages. Nowhere to sign up? Where the hell do you live, on some island? Where ever there are people, there are learning institutions. Some of them have life drawing classes. I live in the greater Los Angeles area. If I wanted, I can find a dozen or more places to take life drawing. I used to go almost ever day when I was younger and hungry for a job. Don't make excuses and take your art career serious. Otherwise, plan to fail.
P.S. I used to sneak into Life Drawing workshop classes when I had no money.