Welcome
@AndrewBrown3499 !
Each country has a different set of requirements and a different process for obtaining a PH license..
Most (all) require formal training and a test be taken related to the local flora, fauna, laws, etc.. Some countries have a reputation for being significantly harder than others to obtain a license..
I think you'll find the cost of training is substantially cheaper than most trade type schools in the US.. the last time I looked at various PH courses in South Africa for example, it was about $800 all in (including room and board, meals, training, course materials, etc) for I believe a 10 day course of study...
But I think you'll also find that compensation for a new PH is extremely low compared to even the lowest/entry level positions in the vast majority of trades here in the US.. Be prepared to live on an incredibly tight budget.. and be prepared to do other work during the time of year that there arent many hunters visiting (most PH's I know are farm hands, or farm managers, or have some other sort of job that they do for a significant part of the year in addition to being PH's.. this is especially true of the younger guys that dont have an established client base or reputation...)..
Theres all sort of legal/regulatory hurdles to overcome beyond training.. for example, anyone can attend a PH course in most countries.. but in most countries you either must either be a citizen or have a residence/work visa in hand and be living in the country for a prescribed period of time before the country will issue you a license..
then there is the obstacle of firearms ownership.. its not like the US where you can just walk into a gun shop and just purchase a rifle to use.. it is often times a multi-year process (country dependent) to be able to legally own a firearm..
Im sure others will come with even more information..
This isnt to discourage you.. there have certainly been numerous US citizens that have lived in various African countries and that have worked as PH's while living there.. the goal can be accomplished..
but its a difficult task in many cases.. to enter into a career field that doesnt typically pay well.. and may well cost you a good bit of money on the front end before you are ever allowed to start earning any pay..
you have to be in it for the love of the bush.. because it wont provide a whole lot more than that for several years after you get started..