Welcome lost to irv2 glad you found us.
Here is a link to get you started will cover allot so read and learn.
It has your converter on links within this link.
You may want to think of surge protection for your electronics which is in link also.
Batteries need ventilation unless they are AGM's, possible explosion if not.
I'm sure others will chime in with their views.
Before you start I'd draw out a plan so you can have a reference for trouble shooting later.
Have fun and watch out for live voltage circuits.