You need to dock to go off to other planets or move large items. There's a lot of 'under-average' tutorials out there but I'll try to whip one up for you
(or maybe find a good one).
Suffice to say, docking is almost ALWAYS stressful and takes a LOT of patients (especially with large payloads).
Mods I use are;
Lazor docking camera
a few parts (Kerbal-X and a few others)
One thing I have found with the station is to have a long docking arm but make sure the station is not rotating or spinning (KILLROT and facing a normal ot anti-normal direction helps). Here's my docking arm or KSS-2 (KSS-1 met an untimely end ... killing all on board