I can definitely identify with not only wanting to create a language, but to be able to do it easily. Now, the easiest way is to use simple words or phrases rather than building the whole thing. As I understand it, Tolkien studied languages quite extensively, and so fabricating his own was not so large a task as it would be for you or I, not being qualified to professor courses on languages. Short of spending years learning various languages in depth (which I have great interest in doing anyway) I plan on analysing the grammatical structure of various languages, including English.
You see, I know more about the simple How of using the English language. But I can't tell you how it comes together. It's a sad fact, but the American public school system is supremely lacking. They spend time teaching things you should have been taught in grammar school (HA), or primary, but not a whole heck of a lot of time teaching you what you really should know for your age. I lucked out with an old school high school English teacher for a grandmother, but there were never sit down lessons. I picked up almost everything I know from simply reading.
And so, I'll continue to do so. Pick up books about English grammar. Understand why English is the way it is and how it fits together, and then study other languages: French, German, Italian, throw in Latin for a nice base as French, Italian, Portuguese, and Spanish all sprouted from it. Look at some Greek and Russian, and if you're feeling especially ambitious, choose an Asian language, which has a completely different root system from the Indo-European. You might also look at Native American, Egyptian (ancient and modern). It's a lot of reading, but with all the variations, it really allows you to understand the fundamentals of spoken and written language in a way that you can then manipulate for yourself. It's much more difficult to build in the dark than to turn on the lights and see what you're doing. Finding the light switch may be an epic journey itself, but it makes the task at hand MUCH less painful.
If you're doing it for yourself, or because you want more than a phrase or two here and there, then it's the best process I can advise.
I've got the basics of one of my languages in that there's a large base for vocab and modification of words from singular to plural to posessive, etc., but there's no grammatical structure just yet.
Personally, I'm also reading up on dead languages -heiroglypics to various cuneiform- to better understand not only the distinct variations between the old and the new, but to give me ideas about how I want my own to find their structure. Do I want it to reflect a more modern dialect, or be remeniscent of more ancient times?