Here's an idea for you,
Take it as slow as possible. Many people rush into it when converting from tropical to marine. Do as much reasearch as you possibly can. The more you learn.... the more you will want to learn. There is so much to it. Some great video's on youtube too i HIGHLY recommend these.
Another great idea would be for you to post your ideas on here before doing them. That way you will get the best advice and will limit mistakes. There's tonnes of advice on here!
Best of luck and i look forward to seeing your new SW