Hey Melwis!
when you say "what stats to keep track on", do you mean stats that describe your own play, or play of your opponents?
i understand that you don't want to invest money if you wont be considering poker so seriously, but tbh it will be quite difficult to look into stats without such a program. i am really not aware of any Excel document that will keep track of these stats - if you are that interested then i think you should just invest in the program because it will be recorded much more effectively and reliably than if you were to input data manually.
about the important stats, i guess the most important imo would be VPIP and PFR - 'voluntarily put money into the pot' and 'preflop raise'. these two stats are pretty important.
conversely, i'd say that things like $/hr and Result would be pretty bad stats to keep an eye on because on nl2 you should not worry too much about what you make per hour - it will be just so small. also, if you are just beginning/rookie then you should look at improving your understanding of the game rather than looking at winrates and $/hr.
so all in all i think the following stats would be the most important stats to track:
Total Hands
VPIP
PFR
bb/100 (if you really want to monitor your winrate ♦ )
notice how most of the stats from your list i have removed - this is because they aren't really necessary. for example time played - i don't think it really matters how long you've played for but instead how many hands you've played. this leads me onto my next point...
something that you should probably keep in mind is that you will need A LOT of hands in order to get an understanding of how your game is doing. when i say that, i don't mean hundreds or even thousands of hands - if i were to recommend a decent sample size it would have to be a minimum of 50,000 hands but preferably 100,000 hands at least. for this exact reason, tracking your winrate, $/hr and Result will be quite pointless because i'm sure as a beginner/rookie you will most likely not be getting close to this sort of volume for a while. also, as you work on your game and improve certain aspects this will completely change your game - every time you learn something new. therefore whatever winrates you do see will actually not be very representative of your game.
this might not really answer your question very well but it is quite hard to track your game without tracking software. imo, if you are drawing happiness and enjoyment from playing as you are then just continue doing what you enjoy
but i would definitely recommend going through the strategy content on this site and learning as much as you can from it. i think this would be much more productive than worrying about stats especially since you arent prepared to invest in PT or HM. i just don't think it would be reliable to track such information manually.