you should absolutely not be running half court press of any kind at your level. you can run straight zone, but you really need to work hard to get some offensive studs which you can then ride all the way to the bank. you can do that at the expense of walkons - that is the advantage of zone - but you need the higher quality starters to make it work. a zone starter might play 30mpg in a tight game where as a press guy might play 24m, thats 25% more - thats a lot more you can get out of a guy, running zone. a team full of players that aren't that great, plus walkons, doesn't really work for any system.