For tablature and standard music notation, I have used both TablEdit and Finale with good results. For chord/lyric songsheets, I use MS Word. Any word processor should work equally well. I think it's much easier to create, edit and combine songsheets
before they get converted to PDF. Therefore converting Word files to PDF is the last step in my workflow.
For personal use I save each song as a separate file in standard DOCX format. This is my archive copy and the one I'll use when (inevitably) I find something to change later. Then I use Word's "Save As" to export the file in PDF format. The PDF file goes on my Android tablet where I import it into the MobileSheets app. When I make a multi-page PDF book to share with others, I create the whole thing in Word including table of contents and page numbers. Save as DOCX, then save as PDF.
Check your word processor's settings to be sure you are embedding fonts, and converting non-embedding fonts to bitmaps. This should ensure that everyone can see your PDF the way you formatted it. When in doubt, use a non-proportional font (Courier).
When I need to combine several PDF files into one, I use a Windows freeware utility called PDFBinder. When somebody sends me a PDF and I need to incorporate it into a book I'm building in Word, I can import it into Word as an image. I have several programs that claim to edit PDF files, but it never seems to work smoothly and for a simple songsheet it's just not worth the effort.
As a completely different option, when a song has lots of chords and I do not know what key I want to use, I might type it up in Word using ChordPro formatting, copy it, and paste it into the Song-a-Matic editing window:
http://ukegeeks.com/songeditor
Two important things to note if you're using the Song-a-Matic:
1) You cannot save the songsheet. You can
print the songsheet. Which means you need to install a PDF converter that works as a print driver. CutePDF, PrimoPDF and DoPDF are all good and available free (for Windows, I'm not sure about Mac or Linux). With the PDF converter installed, all you have to do is use your browers's print function and select, for example, "cutePDF" as your printer. Now you can save the PDF file to your computer.
2) You cannot save the data in the edit window. So copy it and paste it into your word processor and save it. But wait, you say, didn't you just copy it
from the word processor in the first place? Well, yes, that's what I said, but in practice I always make a lot of little corrections once I'm working in the Song-a-Matic edit window and I don't want to lose that work.
Left to my own devices, I save a lot of songs in the GuitarTapp app on my tablet and never convert them to PDF. I think in the future we'll be living in ChordPro more than PDF. But for now, PDF is the most foolproof way to share with others.