When one learns from a grammar book, one also needs a reader and a composition book. Beginner's books, like D'Ooge's, combine the three. I would recommend doing D'Ooge along with one or two other grammar books, just for comparison. Concentrate on D'ooge until you have it mastered. There are reading and writing exercises as you go along, and at about Lesson 50 ( of 78 ) D'Ooge gives you longer passages to read.
I strongly disagree with these recommendations. You will spend months covering the same principles and after 2 years you will know no more than you could have learned in 3 months. In my opinion the best course is to use 1 grammar and work all the way through it. Make sure you learn all the paradigms properly, and as much of the syntax as possible.
If you must use a reader, then at least wait until you have covered about 3/4 of your grammar. Better still, mea sententia, would be to start reading a 'real' latin text, e.g. de bello gallico, preferably with annotations to help you with the difficult bits of grammar.
Start composition when you have finished your grammar. Afterall, every grammar book i've ever seen already incorporates composition (i.e. english to latin exercises).
“Cum ego verbo utar,” Humpty Dumpty dixit voce contempta, “indicat illud quod optem – nec plus nec minus.”
“Est tamen rogatio” dixit Alice, “an efficere verba tot res indicare possis.”
“Rogatio est, “Humpty Dumpty responsit, “quae fiat magister – id cunctum est.”