Welcome to AQ.
Let me try to answer your queries.
1. It depends on whether you are going for a high tech or a low tech setup. A high tech usually means higher maintanence. Usually we recommend 20-50% of water change weekly dependly on your setup and bioload.
2. You may make use of the aquarium calculator link to roughly gauge the electricity consumption.
3. At the west, you may want to try the C328 LFS.
4. Read this link to understand what are the things needed to start a planted tank.
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