any idea how much this would yield?

If I decided to start flowering now?

Should I just wait? the tallest plants are only at about 8 inches but I could really use the bud asap..

You can go to 12/12 now. Are these clones? They will have to be sexed if not, its hard to tell how many plants will be left.

They are all from seed.. about a month old.

Some have said they need to veg at least 5 weeks to properly flower.. some have said at least 60 days..

you can flower now but the yield is going to be greater for this grow if you veg longer. the choice is bigger plants maturing more slowly with higher yield vs.smaller plants maturing more quickly with lower yield. if you are planning on growing continuously, the majority opinion is that you;ll get more bud with many smaller plants

as for yield on this grow it depends on too many variables to give an accurate estimate - your experience, strain, light conditions, nutes, etc. a wild assed guess would be for a couple of ounces per female plant.

This is my first grow so keep that in mind but I do have 24 plants right now.. even if half are females 1 ounce per plant would kick ass.. I really just need to get this grow done with but I don't want to initiate flowering too soon and fuck up my plants.