The Internet offers many applications that are absolutely free. You can download them and use them to build your home and garden design. What's great about most of these is that they have tutorials to help you, along with the ability to make changes to the designs in case you want to change something in them later on. You can see all of the different applications and find the one that suits your needs the best. It really doesn't matter what application you end up using because they all do a good job of helping you get started.
The application you use is not the application that matters. The application you use will be a tool to help you with designing your house and garden. If you don't like it, you can always change it and make it work better for you. Many applications are going to require you to make changes to the design but once you do, everything should be fixed automatically for you.
What most people don't realize is that the application is free and you can use it for whatever you want. There is no restriction on the application, you can use it to make it your own and make it work better for you. Don't be scared to explore the applications out there to find the one that is going to work the best for you. It doesn't matter what application you use, you can still get something done with it so don't let any fear keep you from trying it out.