you can get a plan to make a specific antenna. get one for a 2m 1/4 wave whip.
you should get a book on antennas, buy one or borrow one. read it and get to understand antennas. you can then decide on projects to try.
you can ask questions on this and other forums. without some knowledge about antennas you won’t even know what good questions to ask. to build antennas or have some background to follow plans you need to understand some antenna theory. now people can spend one or three lifetimes doing antennas, people make careers about doing antennas, people spend every waking minute hobbying about antennas. you don’t have to go nuts. read some general theory, pick a limited specific area to learn more detail; if you have a 2m radio then 2m antennas are what you should do.
here’s a 2m ground plane. what you want to do is that without the radials, just a wire on the center pin (you can use coax with the jacket and shield removed). you also will be using a connector that fits your radio.
websites like the above will provide lots of additional information and plans. you may also find a ham radio club in your area or for 2m specifically a repeater club (a group that sponsors a 2m repeater, which is another aspect of ham radio). people in these groups by their nature and purpose are friendly and helpful.
you would want a horizontal antenna on 2m only if you were using AM/SSB. if you are using FM then stick to vertical antennas.
ham radio is a hobby that is unlimited for money, time and energy. learn a bit and then find what you want to start with. give yourself some limits to not feel overwhelmed.