My main recommendation for people hoping to construct a language is, get a clear understanding of what you're trying to accomplish, and perhaps what you're trying to avoid. For example, some people are enamored of "simplicity", so them invent a language with very few words, very short words and very few sounds (all trivial to pronounce), and then they can't say simple things like "my new white reindeer likes chasing your 3-legged skink". Or, it ends up being really ambiguous, like "big animal like a cow but not actually cow and I own the thing likes to walk very quickly towards small animal like flat dry frog...". Do you want it to be particularly bizarre (a popular theme in sci-fi versions of conlanging) thus challenging from a human perspective? Assuming you know a bit of Hungarian, are you hoping to avoid the phonological alternations of Hungarian, or are you hoping to enhance them?