My concern with Mexican brick is the variety.
If you want to pactice on the seeds from brick weed indoors, you are better off with Canadian brick.
Mexican brick is VERY likely to be sativa and take forever to finish, while growing too large for most indoor applications.
Canadian is going to be either indoor, or a fast-finishing outdoor.

Grow what suits your climate.

On the good side, you can get very acceptable results from commercial seed, and it will teach you a lot about growing.

And if you get lucky and find some plants that are great, then you can clone them.