Hi Sara, this is something we would be happy to help you with. If you drop me a mail at firstname.lastname@example.org I'd be happy to tell you more.
For a practical guide to what works best for learners, I would recommend 'elearning and the science of instruction' by Ruth Clark and Richard Mayer. They have done extensive research into the evidence about learning outcomes, to recommend a whole series of best practices. It's readable, with exercises.
Additionally, 'the really useful e learning instruction manual' by Rob Hubbard is a very handy summary of what someone with 20+ years of ID experience has in their head.
The 'Rapid e-learning blog' by Tom Kuhlman is great for suggestions on how to create simple rapid e-learning. He uses Articulate Storyline but his techniques are applicable very widely.
You can then decide which apps / vendors are best suited to the kinds of learners you have.
If you need any more guidance, my team is putting together a booklist of useful reference works which I am happy to share with you. I am Head of ID at Kaplan: email@example.com
We run a standard open enrolment ID classroom course which has been created in conjunction with Articulate but is application to any e-learning development or platform.
We can also deliver a range of custom on-site courses with agenda to meet your needs ranging from introduction to e-learning design through to more advanced topics.
If we can help, just mail me on firstname.lastname@example.org