I'm maybe 2.5 or 3 months into playing my first Shadowrun ... the first 6 weeks was mostly us building our characters. As a matter of fact, when I went to my local "RP'ing" supply store, the chick at the counter gave me a 10% discount because it takes a long time to build a shadowrun character (that or my charisma is higher than I thought my augmented max is).
There's also a LOT to catch up on in regards to the history, the culture, the interplay of magic and technology. If you haven't already noticed it, Shadowrun is kinda like smashing the Matrix, the Avengers, and The Sorcerer's Apprentice together into one world.
One topic of discussion among my group has been which super hero movie character we've realized we were building or how we could build a given super hero, etc. One guy says... so I'm building my backup character as a mage focusing on electrical abilities with a knack for martial arts when I realized I was making Raiden ...
I'd recommend one of two things... a: start with a basic TYPE of character (Melee Master or Gun Slinger) to get a feel for how the system plays out. After playing your first couple of sessions you'll gain a lot of perspective on what helps, what doesn't, which weaknesses are worth taking and which ones really become a pain to have to RP. The other option would be make an apprentice character of a character of one of the other experienced players. They can help you learn how to use the abilities and skills that you have. Either of these options ought to let the game flow smoothly as you learn, all the meanwhile role playing. The last option is what my group has experienced, more inexperienced players than not. Our first real combat literally took 5 hours for 5 combat rounds. Granted we spent A LOT of time hashing out dice pools, opposition rolls, drone initiatives and handling, and worked through the area damage of 3 frag grenades. In the end an earth elemental died after 3 frag grenades, 2 charges from a minotaur, and lucky slash of a vibro sword. We did have fun...
The last thing I'll tell you is, don't underestimate the value of lessening your attributes to be able to afford augmentations, magic stuffs, and/or gear. A perfect example is a magician build (some might say a flawed example). If you build out the attributes of a magician to the attribute max, you won't have build points available to get as many spells as you're allowed. Especially, if you want to be able to do things like counterspelling, summoning, or use many/any other active skills. I'll admit magicians are expensive characters to build.
With rigging (technomancy and hacking too unless you're a Jack-In-From-Home type) you compound the amount of number of things to keep track of and account for, multiple drones, their initiatives movements etc. If you're a part of people who're patient and as skilled as they are patient, you'll have no trouble and will have fun. I don't want to dissuade you though, just wanted to share this Newb's experience and perspective with another.