I consider the following iPad apps as the best I have used so far. Hopefully this saves you wasting time & money on apps that don't deliver.
I use these iPad business apps every day
For taking notes I recommend NOTABILITY
This app is easy to use with the keyboard, or the handwriting tool which works extremely well, especially with a decent iPad stylus. The handwriting feature is easy to use once you get the sizing right for your style of writing.
For managing PDFs & filling in forms I recommend PDF EXPERT
This app is very good for filling in forms and getting a customers signature. I find the typing is easier & better than the handwriting, but the customer signature feature is very useful. Again - find a stylus that you like.
For business reading I use the KINDLE
It's easy to buy books from Amazon and having books to read on the go is great. Remember - The man who does not read good books has no advantage over the man who can't read them - http://bit.ly/Nc7RXk
I have found the best organiser for me is PI PRO
The integration & functionality of this application is no surprise given that the developer has such a long history in personal organisers.
For freehand drawing I use SKETCHBOOK PRO
This is a flexible & easy-to-use app that enables you to draw or paint whatever you want.
For staying connected I use FLIPBOARD
It's connected to major social & news feeds making it easy to know what's going on.
The browser I prefer at the moment is CHROME
This is usually I personal preference though.
If you want a decent stylus, you could try the TARGUS model. It's simple but comfortable. The only downside is the top which has slightly sharp corners & makes me nervous about a customer signing the iPad with the wrong end. I also have a 2 in 1 pen & stylus, but the stylus end is awkward to use due to the clip & wider end.