Can someone help me with Samus?

[D i v i n i t y]

I've been playing Samus for sort of a long time now and I don't really know anyone in real life who could challenge me x_X
I'm not a total noob or anything but I still just wanan get better for no reason xp
Like, any help with combos would help. Oh and maybe advice on how to play against a Marth user, Peach user and DrMario/Mario user since those characters annoy me the most. I'm still trying to perfect my Super wavedash but I can currently only get it 1/3 of the time. Well yeah, any advice would be useful, vids would be really useful too o:  

[Chaos Harpie]

im a Marth user i can help you out but i only know his combos.  

[Lahlooooouh]

I was strictly a Samus user in SSB and SSBM... in Brawl I now have many mains, but Samus is still my best.

I only played melee for like 7 months.. so I never got as good as a lot of other people, but I was decent. Right before Brawl came out I just started figuring out how to get the super wavedash, but I would only get it every once in a while..