INB4FLAME
Alright, well I won't flame you, cause I like helping n00bs out
First off welcome to the Marth boards! You can find several topics around here to help you out.
As for critiquing, wifi is terrible for critique and it's rather hard to get a grasp on your gameplay when I'm actually playing you lol
If you could replay some of your matches in tourney and in friendlies, EXTREMELY PREFERABLE IT IS NOT WIFI, I would personally be happy to critique you. I understand your woes of lacking a capture card, but we here are a friendly, albeit sarcastic, community filled with members willing to help you out. So when you get those replays, just ask around here, there's plenty of people on these boards with recording equipment.
I would also prefer if no one posts after me with spam or just reiterating what I said, to reduce clutter. Only post if you can help this guy out.