Thanks for writing - and first we would like to mention that it's awesome that you mentioned Ephesians 1. According to the AENT with Footnote, there is very deep meaning in this passage:
Ephesians 1: 17. That the Elohim of our Master Y'shua the Mashiyach, the Father of glory, may give to you the Spirit of Wisdom and of revelation in the recognition of him. (AENT)
Footnote: Four attributes (sefirot) of YHWH are being described in this one sentence: shubkha (Heb. Hod) = majesty/glory; chokhmata (Heb. Chokhma) = wisdom; gilyana (Heb. Shekhinah) = revelation/manisfestion; and yadai (Heb. Da'at) = spiritual knowledge. Two of these words are exact cognates, essentially the same words from the Hebrew. Two others are close synonyms. Rav Shaul uses a synonym for yadai earlier in this chapter: sakal, rendered as "spiritual understanding" in 1:8. Other attributes (sefirot) are very clearly described throughout this first chapter.
Moving on to your questions: Yes we can and should use them today, in our current lifestyle! The commandment to wear tzit-tzit was a "forever" command! Numbers 15:37-40:
Tzit-tzit are made with "loops" on the end so they can be looped around belt-loops on pants or dresses. Since the commandment is to "wear them on the corners of your garment", we often see tzit-tzit put on in pairs - 2 on your left hip, and two on your right hip, where the seams of the fabric of the pants or dress come together. Another way is to tie the tzit-tzit onto a string or belt, which you can then wear around your waist, over any garment. Another way is to wear a "tallit katan" - sort of a "vest" with the tziti-tzit tied to the corners of the vest, which you then wear.
They can be purchased from a number of vendors on the Internet, if you have access to that and a credit card with which to make payment. Simply Google tzit-tzit - and bear in mind that most traditional shops do not include the blue thread, so in most cases, if you buy ready-made tzit-tzit, you must still take them apart, and re-assemble them with your own blue thread.
You can make Tzit-tzit from needlepoint or crochet thread or yarn, the kind called "chainette". Chainette threads are a particular type of round thread. They look like a long line of crochet loops and cannot be divided into individual strands. The kind we are familiar with is "Red Heart" brand, "Luster Sheen, No. 2, fine". All you need is a roll of white, and a roll of blue. You will use a whole lot more white than blue as each tzit-tzit requires 3 strands of white and 1 of blue. Tying you own takes some practice, but it is not hard. Click here for a site with some instructions.
You can buy the thread at any fabric store or from Judaica shops - but the Judaica shops will charge a whole lot more since they will already be cut to length, and packaged.
Depending on your situation, wearing Tzit-tzit in public is fine. But if you feel uncomfortable or fear being confronted about them, then wear them "tucked-in" where they do not show on the outside. Yahweh said "It is to be a Tzit-tzit for you to look at and thereby remember all of YAHWEH's mitzvot and obey them, so that you won't go around wherever your own heart and eyes lead you" - and you can still know they are with you, even though they are tucked-in. On the other hand, if want to wear them so others can see them, it will give you great opportunity to talk to others about the importance of Torah, and obedience to Yahweh.