Even if I knew where you lived and what your climate is I would not know what plants grow well in your area. If you are in the USA your county extension office would know. If you are somewhere else, you probably have an agricultural department that can help with types of plants. In any case I’d be looking for a mix, a variety, so you have different things that grow at different times of the year.
Some people like to start with baby chicks, some like to start with older birds. We all have our reasons. It helps answer this type of question when we know your criteria. In your second post you gave one thing that concerns you, biosecurity. To me here are two ways to bring new chickens into your flock with a very high level of confidence that you will not have biosecurity issues, either get hatching eggs from a source you consider safe or buy chicks from an established hatchery. Lots of people bring older birds in without issues, but some do have very serious issues if they bring new birds in. Quarantine can help with some of these issues, but it does not cover everything. Some birds can have a personal immunity to some things yet still be carriers. Quarantine doesn’t help much with that.
I don’t know what other criteria you have when making this decision. And you face the logistics problems of getting the chick if you only want one and of raising it yourself. I don’t know how I could get just one chick and know it is a cockerel. I would not raise a chick by itself. But maybe you are looking at getting several chicks, which is the way I’d approach it.
There are just too many unknowns for me to know what is best for you. I don’t know your criteria.