Make sure you use a tank cart to move it around too. There are much smaller tanks avaliable, something about a weight in the fifteen pound range. To save on thinner, you can use a cheaper brand thinner to run through the airbrush to clean, instead of using what you're thinning your paint with. I've been having some trouble cleaning out my airbrush after using acrylic paints. Water doesn't seem to help like it does on regular brushes.
Simple kitchen dishwashing liquid really helps to cut the paint.
Clean the paint cup first, then fill it with alcohol and spray it into a rag. When the cup is about half empty cover the airbrush nozzle with your finger to force air back through the airbrush into the cup. Repeat the procedure till the alcohol in the cup remains clean. When your done for the day take the entire airbrush apart and clean everything, otherwise you'll find that the needle is likely to be stuck the next time you use it. I've been using Polly S thinner with Tamiya paints.