You need to determine what additives will be put in the plaster mixture: sand, perlite, paper fibers.. practice until you find what you need. Mostly for small repair I use the sand. Don't forget applay a plaster weld (pink) or primer before texture and after. For texture like this I'll recommend round tar brush with long bristle. make a plaster mix with sand, tap the plaster with bristles, pull straight away. Wait few minutes, look at it, flatten your pattern or tap more if needs. Wash brush after each applications.