Hi MichaelEx, welcome into the Helios-System!
I agree Lasersmith, good plan to get a ship.
There is a very good introduction for ship building, unfornately its in german
If you want I can translate it for you.
The basic elements you can buy on Alioth Market 06, for this you can take the shuttle from Haven Market 06 to Alioth and there you take the teleporter to Market 06.
Small Elements are very cheap, like a dynamic core s, wings, rotators and so on.
But take your time for your first trip to space, I waited a few month before I left the atmosphere of Haven, because there are no good tutorials for this and I was a littel afraid to crash my shiny new ship ;D
Its easy to leave planets with enough space engine power, but not so easy to fly back into atmosphere
You will see, that this game is wounderful if you like it to build ships/buildings, craft things, explore space and planets!
Have fun! And if there are questions than ask