For getting used to IO sets and their bonuses, I'd recommend you to get familiarized with them at paragonwiki.com
Also you can find the Official introduction to them here:
Clicky
Bear in mind a few things:
- Set Bonuses can be used to maximize your toon strengths and/or to compensate deficiencies, so you'd better know in advance what are you looking for in your toon.
- It is usually not a good idea to concentrate in the bonuses a single set in a single power grants, you need to see the whole picture, I mean, you may give up some accuracy in your attacks by slotting a determined set but have it compensated by slotting another set in your defenses (this is just an example)
- Download Mid's Hero Designer, will provide you with stats and percenteages in an easy and useful way Clicky
I ahve posted a few builds to maximize the positional defenses above the soft cap here in the scrappers section. They are for DM/SR acrappers, but you might get some ideas there (even if it's how NOT to do an /SR build for you, would be an idea anyway 
)
Such general advice is not that easy, if you get a little familiarised with IO sets in paragonwiki.com and try a few builds in the designer, you'll get a good idea of what is it about and will be much easier to offer advice if we know what is what you're looking for.-
Anyway, feel free to PM any time for more focused advice or send me a tell in game @Nightmarer, I am afraid my English is not good enough for such general advice but I've done a bit of research for bonuses, specially for /SR in my DM/SR and Katana for my Kat/Inv
Hello everyone, I just returned on CoH and..
I'm really confused with all the new enhancements >_<
So I'm searching for help/suggestions, I wanna try to slot my Katana/SR with IO but.. I really don't know where to start..!
Can you please be so kind to help me?
Thanks