Help to learn more people doing inventory of trees, bushes, greenwalls in city

Hello I'am Virgilijus I finished forestry studies and now I am working in Lithuanian capital Vilnius my primary job is to make inventory of trees, bushes or green walls in city, but there is a lot of young peoples with want to get experience in this job to make their living in future, but we don't have enough tools to help them learn correct without any issues i want to get one new tablet to help, but i have only half amount of money we working with Arc GIS collector program so we trying to get as proffesional as we can tablet