you want to date multiple women at the same time? that can happen. However, there's some specific things you have to do.
1st: you have to be ok with her dating other guys at the same time, and be completely non-jealous about it. Some girls might even try to play jealousy games with you to see if you'll get jealous, watch out for that.
2nd: you do have to tell her. however, I would tell her 'I'm single and I like being single' instead of 'I'm dating 4 other women right now'. And I would only tell her that after you decided you like her and she's decided she likes you (after the first kiss and before sex happens is a good time to make this clear)
3rd: You should limit your time together. This is a tough one. But you shouldn't see any individual girl more than once, Maybe twice a week.
4th: If you do get more than one girl who is cool with that, then you need to try your hardest not to rub it in their faces. You want to keep your girls separate. This includes things like photos, house cleanliness, as well as more obvious things like cell phone messages, and no double booking.
After that, trust your gut on what is best for both of you
