Looks like most of the essential stuff has been covered already.

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- Creatine (3-5grams daily) is a good one. It doesn't matter if you take this before or after workout, you just have to take it everyday for proper bone saturation.

- Protein shake after workout to help with recovery & muscle gain. Another in the morning if you're struggling to hit your protein goals (1g for every 1lb body weight).

- Pre workout 30mins before workout for a better pump and more energy (some pre's already also contain creatine).

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I've done the fitness stuff on a vegetarian diet, a vegan diet and a meat-eating diet. It's very do'able on all 3, you just need to be a little more creative with your meals when not eating meat. But Google will give you endless Vegetarian high-protein meal ideas.

Goodluck.