How to convert FASTQ files to QZA files ?

Please be patient, as all Qiime2 support is a free service provided voluntarily.

Did you try to use "search" function on the forum?
For example, the first result I am getting is this one. It is very similar to yours, and there is a link to the tutorial. I strongly advise you to read through the tutorial first before asking any additional questions. It contains the command that you are looking for.
The topic I linked also contains links that you can find useful for downstream analyses of your data.

Best,
Timur