Advice for a newbie

Hello, and you're very welcome to the Forum.

Your question raises a situation which arises for almost every newcomer to the Hobby - my suggestion to you would be to read through the Forum (especially the Beginner's Section), questions and answers. By doing this you will find answers to many of your queries.
From the point of view of how many fish you can keep - whatever else you may or may not do, the golden rule in my opinion is to take things steady! Only get a few, even just a couple, at first and build up your stock gradually! This will allow the filtration bacteria to cope with the 'load' from your livestock and multiply accordingly.
Likewise with feeding - you will do less harm by underfeeding them than by overfeeding them, honestly!

As to what types? - it's all down to choice...have a look around and see what takes your fancy - but please don't buy anything until you make enquiries. Not all fish are compatible with all others. Make a bit of a list, be it from books, online or in your chosen fish shops. But ASK before acting. Most Fish Shops will give good advice (especially the ones on this site who actually sponsor it and the associated Clubs) but you can always come back here and ask too, there should be someone with enough experience of keeping your chosen fish to say 'Yay, or Nay'.

But at the end of the day it's your tank to make the choice of inhabitants for, people can only advise...

You must remember, though, your water test results are those for an empty tank (of livestock), putting fish in will upset that happy medium, so, as I suggested at the start, slowly does it. I know as well as anyone how hard it is to look at a tank with very few fish in it, but you've looked at an empty one for two weeks, so any stock will be a bonus...and, on top of that I have to say - there's nothing worse than daily removing corpses of the fish you paid good money for!

Let us know what you decide, and good luck, you've chosen a rewarding hobby.

John