Waalikum assalam wa rahmatu Allaahi wa barakatuh
Alhamdulilaah. In shaa Allaah you’re in the best state of health and eemaan.
It does get overwhelming sometimes, not knowing where to start. What I would suggest is definitely start with the Qur’aan. This is the most important of knowledge. Read, memorize and understand the Qur’aan. Perhaps set up a schedule for yourself to memorize/read a certain number of pages a day. Allaah swt will bless your time the more time/effort you put into learning His Qura’aan.
Next, I would advise you to start with tawheed. This is the most important aspect of Islaam. Without tawheed, there is no Islam. When seeking knowledge, always start with the basics. Build your knowledge off the foundations of Islaam so that the knowledge you learn later on will be authentic.
The first book to read is the 10 Nullifiers of Islaam by sheikh Muhammad ibn Abdul Wahhab (rahimahullah). It’s important to know what takes you out of Islam so you can avoid falling out of the folds of Islaam.
Next, read The Four Principles of Shirk also by the same sheikh. This is essential as you don’t want to fall into shirk.
For the basics, I recommend reading/understanding “Usool ath-thalaath” (the three fundamental principles) by sheikh muhammad ibn abdul wahhab. This goes into detail about the three questions of the grave (Who’s your Lord? What’s your religion? Who’s your Prophet?) And within this, you learn all the aspects of Islam- the pillars, eemaan, etc. And don’t just read- understand, memorize and take notes.
Once you’ve got the basics, it’s easy to move forward. But the basics themselves take time to fully understand. And always remember- be careful who you take your knowledge from as this is very important. Only take knowledge from authentic sources that don’t contradict or go against any aspect of the Qur’aan, Sunnah and the practices of our pious predecessors (radiaAllaahu ‘annum).
A brother on tumblr recently posted a list of books that should be a foundation to building your own library here. Baraka Allaahu feeh, it’s very helpful.
Also, if you look in my books tag, I have many posts with book recommendations for beginners compiled by our noble scholars.
May Allaah subhanahu wa ta’aala aid you in your journey of seeking knowledge for His sake. Always remember to renew your intentions so that you may be rewarded- it’s all for the sake of Allaah.
“Whoever treads a path seeking knowledge, Allah will make his path easy for him to Paradise.” (Sahih Muslim)
"My Lord! Increase me in knowledge" Surat Taha (20): 114