How to Start: Arms Reach

I'd like to Start Potty Training...

My daughter is going to be 2yrs old April 1st and she shows an interest in going to the bathroom and sitting on the little potty that I bought her. Now the only thing is I also have a 3 1/2 month old son. I've have been told that because he is in diapers, she is going to want to stay in hers also. And although she is saying that she wants to sit on her potty,I've been told that she really isn't ready. I've put her on there, but she'll sit there for 10 to 15min and then I'll take her off. So should I not even try yet? Or is this how it...