Yeah coding on an iPad was never going to be a great way to go about it.
Have a browse on W3Schools Online Web Tutorials
awesome website with some nice try it yourself areas!
HTML is very simple.
HTML5 has a few more features but is still very user friendly.
CSS3 is probably a step up and a tad more complicated but again you should be able to pick it up.
From there, where you go is your choice.
I'm biased towards .net as i'm a .net developer, I know many of people that hate it but it's definitely a solid language to learn either C# or VB
, and asp.net.