Working with the local deaf community, as you're doing, and supplementing wit the on-line courses will probably get you there eventually. Formal face-to-face classes could speed up the process, and improve your grasp of the grammar. However, those classes might be harder to find and more expense than you want to invest.
If you were interested in interpreting, I would insist on the formal schooling.
That's normal for hearing people. Concentrate on getting the conceptual meanings of the signer.
If you were going to be a terp, you would have to also focus on using the appropriate English for voicing but since you're not interpreting, you can concentrate on the meaning without worrying about the actual English "word" that you need.
