Lightroom isn't meant to be used to edit jpg images from a cellphone anyways. So, I wouldn't go that direction. Just curious, if you're a "huge photography enthusiast" why are you relying on a cellphone anyways? I would only use a cellphone in a pinch. BTW, nice images, you have a good eye (which is 70% of a good image).
Personally, I would never use a cellphone app to edit images, so, I couldn't help you there. A simple PC program that I've used since 2000 is ACDSee. Its a multi purpose, inexpensive, software. It does have photo editing features (that I rarely use) that should do all the basics. If you wanted your images to "pop" making them warmer wouldn't do that (normally, adding a yellow tint = warmer image). Making them "pop" normally means a correct exporsure and over doing contrast. (there are other methods as well, but thats the easiest and most common).
Finally, this is 2013 and unfortunately, editing is a large part of photography these days. I would suggest that if you suck at it, its something you are going to want to learn. ACDSee is a good start. I love that software. (PM me if you end up getting it and have questions).