Think of what resources your clients may need and start adding those to your resource page. Most of the resources we offer at www.VAjot.com are ones that most clients may need at some point. They will probably need shopping carts, email management programs, domain, hosting, website, bookkeeping, cloud storage, etc. to name a few.
I keep all my resources on one page and whenever my client needs something like an autoresponder program I'll say, pop over to my resources page and look at all the autoresponders you could use and once you decide on one grab it there. Here's one of my resource pages.