Ive tried to do one with guides and..it didn't turn out very good lmao

Any advice helps, really. It'll help me out greatly <3

Every artist has to start somewhere after all

Nobody draws an exceptionally good fullbody their first time.

In order to even get to that point, what you really need to do is just practice. I'd highly suggest just looking up drawing tips. Little things often help the most.

Practice anatomy, practice just head shots, just paws, etc.

Put them together.

You really can't just whip out a masterpiece without doing anything before. You have to practice and put in the effort. Red-lining is a good way to start.

I'd look up stock images on DA and reference from 'em.

... less than ideal.

So, I would start small - a simple side view. The better you get, the more you can work on perspective. As you are learning, the main thing is proportionate - try not to think too much about 'beauty', but rather questions like 'Is the neck too long?' 'Is the body a good size'?

That sort of thing. And yes, as everyone else said - make sure you get the actual anatomy right. Just scroll through pictures and references, and you should be fine :)