Hi I tried the search function to search for anything that already answers my post but couldn't find it. If I overlooked it then please lock this topic.
I am a bit ashamed to ask this because I think it's one of the basic card-magic moves, but even while practising cardmagic for a couple of years I still can't do it

I don't know how I should explain what I mean but let's give it a try.
And I don't know if there is an 'official' name for this thing, but my question is:
How can I properly spread the cards out on the table in a straight row (or with a little curve in it)?
I mean something like this:

When I try to do it I get something that looks like it, but much shorter and a lot of 'chunks' in it

When the deck is placed on the table (before the spreading) is it supposed to be straight or beveled a bit?
Where should I place my fingers and which fingers do I use?
Where do I put pressure?
Could somebody please give me some tips?
Thank you already...