This is not an impossible task, but it might involve a bit of work.

For tutorials, I'd start with Clint Patterson's blog series in the Community Blog here. It's quite current, and it's aimed at new developers. It will get you reconnected, and may be much of what you need.

Scott Wilkinson has some very good, albeit a bit more advanced, tutorials at DNNHero.com. You'll need a subscription to that site.

Look for some older tutorials from Chris Hammond in the Video Library here. Chris is also the creator of a modern module template that is referred to in the tutorials mentioned above. I think that Chris may have some more recent tutorials, and you should look for his blog. I think all are at chrishammond.com.

As for actually doing the work, converting the modules is going to depend strongly on the way the modules were written originally. The good news is that the basics haven't change, but you may need to do some reworking of the code. If the modules originally were written in an uncompiled structure (WSP), you'll find it a good idea to convert them to compiled modules (WAP), probably using one of the templates.

And, I'd be remiss if I didn't mention Mitchel Sellers' book on DNN module development. While it is several years old, it's still quite appropriate, DAL2 is new since the book was written, but you can pick that up (if you need it) from some of the other tutorials. It's available in physical and Kindle formats.

Beyond that, ask lots of questions.

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Joe Craig
Patapsco Research Group, Ellicott City, MD
DotNetNuke Development and Services (http://patapscorg.com)

I still have some modules that were developed for the 5 version that still run today. You will likely run into depreciated methods but the old structure (controller/info class/data layer) should still work. However, you would be wise to look at the "new way" of module development: webapi, angularjs, DAL2 etc to guard yourself for the next major version and beyond. 

Good luck!