I would say... please don't...
There are a lot of consent issues with making tulpas just to date.
You are making a person in your head and essentially programming them with the first thought that their purpose in life is to be with you in that way.
And more, where would that leave the tulpa, created for this purpose, if you decided to break up? Because remember, you don't actually love your tulpa yet. Not really. You might like the idea of your tulpa, but you have no idea what they'll grow into. So you're creating someone entirely for the purpose of dating you that... you may well realize isn't even your type.
And even putting aside the existential issues the tulpa who was created to be a romantic partner will go through, I don't think YOU really want this. It might sound like a good idea at first, but I promise it will drag down any relationship you do have, even if it lasts. Years after creation, you will constantly be wondering in the back of your mind if your tulpa only loves you because you made them to. Which is just not conductive to a healthy relationship at all.
Making a tulpa for friendship and companionship is great. And sometimes things will grow from there into something romantic. But they shouldn't be forced.