Here are some suggestions. Everything is optional, it just depends on how casual/competitive you want your deck to be. These suggestions are budget, but should still make the deck more effective.
Things to Take OutThings to Put In- Lands
You want about 36 lands, unless you are playing competitively or with a much lower Average CMC.
- Ramp
You want around 12 ramp cards to accelerate you into the game.
- Other Cards Cards
At this point, you can customize your other free slots. You can add more removal, or focus on putting in cards with great value. Here are some suggestions, but you can ignore them if you want:
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Good Luck!