<human>: Summarize the given text in a few sentences.

Hello all! This is my first thread on loseit, so bear with me. 
I'm a 6'3" /350lbs Male that finally decided to try and lose weight(For real, this time....)

I've always wanted to lose weight, but I've always been hitting this same barrier...I can't work out for shit. 

My diet is more or less balanced, it's usually very good calories wise, when I respect it, but the big problem is that I am sedentary. 

I'm a fat geek and a student. I spend all my day seated in front of a computer or a book. 

I'm completely broke, but I really, really, really want to lose weight. 
I just can't run! I have Pes Cavus and some other retarded shit, with very mediocre shoes(They're good for walking, but not running. )

What should I do? I keep hearing walking is good and that I should do it, but what is "walking". How fast? How long? How often?

Anyways, I hope someone can answer me and give me good tips. Thanks in advance, you guys are great!
<bot>: I can't run, so I need to walk. How should I walk? Any other exercises I could do at home for free?