Greening in your wedding or candelabra stand properly will give a framework that will determine the eventual height and width of your floral display.
You can do mass arrangements of nothing but flowers, but keep in mind that would add significantly to your cost, since blooms are more expensive than greens.
Use large leaf greenery for big sprays. Below is jade, a big inexpensive fern with broad leaves and a pleasing shape.
Understand that fresh products cut in the field are not always "picture perfect". Expect a small amount of wastage with every bundle and allow for that when ordering your greenery. Jade is packed in bundles by weight, so the number of stems vary. I generally find that there are between 18 - 20 stems in a bunch of jade.
I use a product referred to as "leaf shine" by professional florists. Greenery that has been rinsed at the farm sometimes show a white powdery residue or spotting. Leaf shine will clean up the foliage and seal it, keeping in the moisture and giving it a clean look.
Do not spray leaf shine on flowers - instead use a sealant made especially for flowers, such as Finishing Touch.
Insert your first piece of jade from to the, tilting it slightly at a backward angle.
If you are doing two arrangements, be sure to do "mirror" images - switching the angles from right to left depending on which arrangement you are working on.
Now insert a second piece from the bottom of the cage, at a slightly right angle.
Note how you use the natural curve of the jade to emphasize that the greenery starts from the middle and springs out to the sides in a natural manner - much like a growing fern.
Continue to add your greenery. Don't try to be picture perfect with the lengths of your greens . The idea is to end up with a natural arrangement that mimics a live plant.
Church florals are usually viewed from three sides. Therefore keep an eye on your arrangement that the floral looks pleasing from the right and left sides as well as from the front.
Greening become quicker as you get used to filling in your arrangements. A good designer can fill in a large arrangement quickly. I generally green in a day or two in advance and transport that to the church, and finishing flowering at the church.
Greens are usually easy to transport - but flower heads can be bruised or snap off in transport. If you have plenty of room in your transport vehicle, then you can finish the arrangement. If you have to crowd several arrangements together, consider finishing the flowering part of your arrangement at the venue.
See how seven pieces of Jade suddenly give you a size and shape of your eventual finished design. Go big for a large church. Florals that seem large on a kitchen table diminish a lot when in the front of a large stage or church sanctuary.