[Q] About ext Partition help help please

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m realy new to this. I just rooted my phone.
Now from whath i understand thath you can install apps to the sd card if you Partition it,and you need a custom rom thath supports it (right??)

Now i saw on youtube thath you can Partition your sd card using rom manager.
my questtion is
1. is this a good way.cause i know there are other ways.
2.if i Partition trouth rom manager will i just be able to install a rom thath supports app2sd and thaths it.
3.if i do number 2 will i be able to install this rom and have app2sd(i really want it) ,,RCS MixHD v3.0,,
4.on the rom ,,RCS MixHD v3.0,, it says
,,,A2SD version - Fat + Ext3/4, 0.5-1.5GB recommended,, explain please
PS.
sorry for bad english im from another country