Well, if you’re new to this, I’d highly recommend you first banish or cleanse the space an yourself. Doing magick kind of makes you shine and attract attention on the other side, and you don’t want uninvited riff raff interrupting things or pretending to be the entity you mean to call, which they do to get your energy as they feed on it. We generally call them parasites.
So in the same way you wash your hands before you cook, you cleanse your magickal space before you work too, and this is called having good spiritual hygiene.
The first book in this link is all you need but there’s other free methods too: Unofficial Tutorials: Spiritual Hygiene & Defense Collection
After that, you are safe to summon, and the full instruction on how to use a sigil for that are here:
(Using blood of not is optional, You don’t need to.)