Delphi Paragon Path. Editor and Puppeteer are your go to Complex Forms. You still need Maxed out Hacking and Logic because you'll need to get into Hosts the old fashioned way.
Two less fade from Threading and +1 Limit from Delphi Paragon means you could skip on Groveler if you wanted. Threading a CF at 6, means limit 7 on (typically) 13 Dice and resisting Fade like you're Threading at Level 4. You should be able to Soak that kind of Fade regularly.
Look at the CF Primed Charge for getting your marks on a Host, or really just about any action in a Host.
Advancement, Submerge, Submerge, Submerge. Your First Submersion should be Skinlink, probably FFF next, then the assorted stat boosts. Once you start getting your Submerge on you'll probably want to keep the assorted Increase Matrix Attribute CFs running constantly.
I'd suggest the following: Editor, Puppeteer, Primed Charge, Cleaner, Resonance Veil, Search History, FAQ, then start picking up the assorted Increase Matrix Attribute, and of course HyperThreading.
Hyperthreading multiple CFs counts as a single CF for Sustaining. So, once you get that Second Submersion grade pick up all Four Increase Matrix Attributes and Hyperthread them into a single CF for lulzs.