Once arriving at the rebel outpost there is a vast range of activities you can do. For example, after purchasing the 500k licence you have access to a large majority of weapons available on the server ranging from 50k-560k depending on what calibre/weapon you want etc. In the rebel shop, you can also purchase a couple of miscellaneous items such as NV goggles, FAK, Rangefinders and more!
In addition, you can capture the outpost meaning that if someone purchases an item, 10% of that items price will be put into your gang funds, assuming you have one.
Also if you're looking to expand you vehicular empire you can do so! There's a rebel vehicle shop with many vehicles for you to buy. Ranging from helicopters - 50 calibre off roads. The choice is yours!