Wormholes

The tengu is a very nice ship, very versatile, but not all things at all times. You will need to refit, or do your scanning tasks first.
I will let others give you a detailed response to every aspect of the ship fitting, but there are a few points I would like to raise.

Wormhole sites are significantly different from any sites you have done before.
A relic and data site can be considered as one of the harder sites from the class above.
Sentry guns are very hard to destroy and exhibit unusual features, they appear in some site to ignore signature size, transversal and all the other expected behaviours. Some have reported losing light ships to them even before the client has fully left warp.
You will need at least some buffer.
Sleepers overall omnidamage. Your weakest resist will be your downfall, aim for a minimum 70%
Do not ignore system effects, they will reward you if you take note and explode you if you don't
Be aware as you scale class, sleepers repairing each other, neuting, warp disruption, and ganging up on you in an apparently intelligent manner are all quite usual. You need to identify this and deal with it as required.
Triggers are critical, whatever site.
Never stop moving.
Income is increasing at the moment, levels are in flux. Up to now it was not a sensible source of income running C1-C2, it is now edging towards it. The majority of your income is in melted nanoribbons that you salvage, less so than before, but still important. Wrecks are a big advertising sign.
Your greatest danger is not from the sleepers.
Dscanning every 3 seconds is not too often.
There is never such a thing as harmless probes.
Solo level 4 in a Tengu, will not result in nice income overall. If you survive the sleepers, it will not be quick, and the tengu is not the ideal tool for the job, and for some sites with Strong RR not always breakable. especially with heavy missiles.
The new shattered space, will be a good home for a more solo playstyle.
But for many solo means I ship in the site and two watching the holes.
Be aware of your environment, and that is hard when truly solo.
And finally everything you bring into a wormhole is a gift to BOB, he will welcome your sacrifice, often, the secret is to earn more than you lose and have fun doing it. you will 99% of your time lose your pod. We like bubbles.

That seems negative, it is not, there is great fun to be had, joining a corp or doing it with friends and giving the scanner/holewatcher an equal share, is much saner. You have the T3 skills, make sure you can scan and fit a covert ops cloak, and there are many corps who will be happy to have you. With those skills, and the attitude to try, you have the core ingredients.
But it can be done solo, imagine the hardest L4, add cloaked gangs of gankers roaming in Osmon and the surrounding systems, no local, and they DO want to kill you, every time. And they will follow and wait for your weakest moment. Think how you would manage that. What is your plan for escape? there is nothing in the fitting to give an indication that you are prepared for PVP combat at all.

That convinient HS you came in, is viewed by us as a food funnel, bringing fresh blood.

And If there is a force field on Dscan that is someones home, and they do not want to be your friend. Make sure they are not home, bookmark the tower, and check often if out of dcsan range from the sites. And EVERY active POS is defended.

You will always need a mobile depot and probes and launcher at a minimum. What will you do when the hole is rolled shut in your face?

Hope that helps, please do not let it put you off, once you know WH you can choose what to ignore, or amend. Welcome. Please join our community, and please come with your eyes open and aware.

RR in c3 sites feels inconsequential.