My biggest headache when it comes to Russian language

[aleckii.livejournal.com]

подехать, поехать, приехать and all the remaining prefixes etc, Until now I still haven't grasped an inkling of an idea where should I use which word...

Сan you guys help me with these following example?

'Wow, I didn't know you would be coming to me today'

'How often do you go to your grand-mother?'

'I will be going to you soon.'

And maybe if you can include some clear-cut examples to differentiate them, it would be great.

How about the word посетить? It can be used to replace go to right?