Hey Miguel,
You have a few options in front of you for the design work.
1. As mentioned, sites like Houzz, Pintrest, HGTV are all great resources to get ideas on designs. My favorite is Houzz so far. I get a lot of ideas from there.
2. A lot of the HGTV shows have some great ideas and designs, and it's become so popular that it largely seems to influence the trends as much as it reflects them.
3. Work with a designer on what you would like to do. Even if you don't have a great idea, if they tell them what your goals are they can often take the blank space, add the walls, fixtures, etc. and give you something that reflects your needs.
I've worked with a few clients where that was the case. They had a few open rooms, knew they needed a bathroom, kitchen, or whatever, an we worked jointly to design the space out.
Take a look online as there are a few companies that can do this. Likely you'll find someone locally, or could find a company like mine that does remote design too.
Cheers and good luck!