Great. Congratulations on making the decision to change. All of what 1 Man said is good stuff.
I will add that mindset and determination is very, very important. This is a long process, and you need to find ways to fit positive changes into your life. Maybe you will bowl 300 and get everything right, but some missteps, bad days, bad weeks and even bad months may be in front of you. This is all okay, so long as you...
NEVER GIVE UP.
This simple and somewhat overplayed, cheesy one-liner may just be the most important element for success. I'll add a few more.
1) Find a way to lift weights that you enjoy. For me, that was heavy compounds with an emphasis on strength. Others have found joy with bodybuilding styles of lifting, others with pure power lifting, strongman, machines, bodyweight stuff, kettlebells, the options are plentiful. Finding that joy keeps you in the gym and keeps you consistent. The same applies to other forms of exercises. If you hate running you shouldn't expect that you will run your way to your goal. Find things that you enjoy doing.
2) Learn to cook and prepare meals and how to plan out your food consumption in advance. Keep healthy food on hands so you do not gravitate towards easy, unhealthy options on days where you are pressed for time. Consistent diet execution day-in, day-out is the ticket here. Four good days and three bad days per week doesn't cut it for me. Damn if I don't keep trying it, though.
3) Consistency wins. Consistency in the gym is how you build the muscle and consistency in the kitchen governs everything. The latter has always been my biggest challenge.
4) Read this website. Read everything you can and apply the proven principles that you can realistically fit into your life. Focus on content oriented towards beginners, which there is plenty of. You are not an advanced lifter, so you don't need to sweat over the same type of details that someone who has been training for 10 years does. Keep it basic, keep it fun, keep it safe.
And don't ever quit. This bears repeating.