Pretending to be an Illustrator

I’ve been pretty bz with work lately, but it’s been great, coz I’m doing what I like most. Anyways, this is a pic of the new church plan I’m working on, trying to make it into an artist impression kinda thing. I’ve never done this kinda things before, but I accepted the job thinking it would be a great challenge. Turns it is a great challenge indeed! I’m not all that good in Illustrator, and it’s so much different from the more familiar Photoshop. So, I’m like wondering where’s the fill bucket and effects tool and stuff, quite a headache. I would really love to make it amazingly nice, like those pro artist impressions of mega buildings and all. I just wonder how to do it!