C.J.
Don't use any hand weights when walking. I didn't listen and still kept using them, now I have a screwed up shoulder. Learn from my mistake.
I personally LOVE my weight vest. I have two of them. One is only eight pounds and I wear that when I run. I bought it at Wal Mart and it was about $25.00. I have a 20 pound vest that I bought years ago at Dick's Sporting Goods. That ran about $50.00 or $60.00.
I wear both when I row or walk on the treadmill. I like to run/walk at a drastic incline. I have worked myself up to almost 12.0 but alternate down to as low as 5.0 ( for running.) I also wear the 8 pound vest on the stair mill. Talk about a WORK OUT!
Good luck and take baby steps--they all add up! :)