Welcome to the forum. Wow 300g that's huge. Will this be your first time working with freshwater or a planted tank? I'll keep a lookout for your journal.
Yeah i had an entire basement "fishroom", it was quite the set up. Was very sad to see it go, but with a 2 year old and 9 month old i just couldn't keep up anymore.
I have kept freshwater fish in the past, but the last time was probably about 10 years ago. I have never tried freshwater plants.