If you want to draw in METERS then you should choose a metric template.
Click on the Big A icon in the upper right hand corner
then NEW > Drawing ....... which will take you to the template selection dialogue box.
It sounds like you want to draw a house, so you might want to use the template shown in the image.
If a template does not specifically mention that it is METRIC, or end with ISO,
it is an IMPERIAL (feet and inches) unit template.
The default unit of measure in a metric drawing will be mms, unless you reset it.
Meaning that if you specify a line be drawn with a length of 1, it will be 1mm long.
If you want to change your drawing units to meters, or another unit of measure, you can do that with the -dwgunits command.
Your modelspace will be rescaled to the new unit of measure.
When you switch from mm units to meters, your modelspace will be scaled down by a factor of 1000.
Having done that, should you specify that you want to draw a line with a length of 1, it will be 1 meter long.
Units expressed will now be meters, so a measuremednt of .5 means half a meter.
All other measurements such as area will also be expressed in square meters, volume in cubic meters, etc.