Welcome to the forum! 
Sometimes putting the sigil under your pillow can get you dreams, but not everybody reports success. I you are already a prolific dreamer and recall your dreams it’s probably a good bet.
If you’re not already a lucid dreamer, the communication is going to be one way, full of mixed in symbology and bits as dreams are, and it’s not a great way to get in touch, imo.
You can just draw it in ink, that’s up to you, most people don’t - the main thing is you must OPEN it. We have a free tutorial for that here: How To Start Using Spirit Sigils To Get Anything You Want - Become A Living God
I would just use the sigil while awake as you can see in the tutorial above.
Please do let us have your Introduction HERE [ ← click me! ], which we need per the forum rules and see our posting guidelines in the FAQ.
Points to cover:
- Where are you from?
- Do you have any practical experience in magick?
- If so, what exactly do you practice and
- How long have you practiced?
- What are your areas of interest?
The getting started guide with all forum orientation stuff, links to tutorials and popular megathreads are here: GETTING STARTED GUIDE, Rules, Notables, Tutorials and References. The links in that megathread are forum-made tutorials for things like spiritual hygiene, developing your astral senses and avoiding impostors and parasites… When you can be sure you’ll not get attacked by parasites, then try Unofficial Tutorials: First Contact from Sigils to Evocation Collection.
For reference:
The rules are here - please read them.
The posting guidelines are here in the FAQ
The Terms of Service are here