This is how I did it.
Usually when you start a language, you start with a textbook. It might be Genki Vol 1, or Nihongo So Matome 1, etc. I created two decks - a kanji deck, and a vocab deck. These decks were only for this single textbook. Every week when new kanji or vocab was introduced, I'd add those to the deck, and become familiar with them over the next week (while at the same time, reviewing existing vocab/kanji).
When that semester was over, and we started the next textbook in the new semester, I'd create two new decks. And so on and so on.
I think it's important to create the decks yourself. It gives you control, and makes you feel more invested in the process. For vocab, I'd always include example sentences. For Kanji, I'd actually have representations in two different fonts. One in the standard kanji font on your computer, but another in HonyaJi, a "hand-written" kanji font. For me, I just felt it helped when writing out the kanji to see how it looks handwritten.
The great thing about Ankidroid is the whiteboard feature. Use it!
If you're not studying a language with logographic characters like Chinese or Japanese, then great, you only need to worry about vocab!
(As for grammar, I never relied on Anki for that. Practice speaking, practice writing. Find local "conversation classes", where you meet up with native speakers. They can practice their English with you, and you can practice your new language with them. As for writing, check out a website called Lang-8. Native speakers look over your work for free, and in return you just take a few minutes to read over their stuff in English).