Hey mate.
I use the same stick and will be upgrading soon however it is easily doable without an upgrade. Here is what I did to become confident enough to start the campaigns.
Run through all the tutorials. Some of them seem mundane at times but they are all necessary. After you have done one or two tutorials and start feeling swamped by the info, make a practice map with a few targets that can't shoot back (ie fuel trucks) and just consolidate what you learnt. My flatmate jumped in and did everything one after the other and as a result things still slip through the cracks.
In doing this youll find out what keys you use most and can then bind the more common ones to your stick. Have a hunt round the forums and print off a Startup Checklist, Keyboard shortcuts checklist, and any other checklists you may find useful. They aid you heaps in the first few flights on your own.
All in all mate there is one hell of a learning to curve to pilot this beast, however if my experiences so far are similar to other new Sim Goers, you will love and thoroughly enjoy the learning experience. EVEN with a standard keyboard and joystick.
Plus you may finally find the excuse you need to upgrade some of your kit :p i know i did