Need Help Setting Milestones Plz

That gives you, what, 16 weeks?

You can lose 3 kg in 6 weeks with moderate calorie deficit and an exercise routine. That puts your weekly milestone of 0.5 kg loss per week (with plenty of time if you happen to lose weight slower).

After that, it's 10 weeks of strength training, I would suggest. Strength training can be split by muscle group, so you could visit gym almost daily, and just work on a muscle group per session. This alleviates the need for a lot of rest days, and allows you to routinely improve yourself.

As for the specific goals - talk to a gym instructor about how to track your strength improvement. You'd usually increase the weights you work out with, or the number of sets, or the number of reps per set - depends on what you want. From my experience, if you are just starting, you'd be able to increase your strength workload every other week.

You're already very light. Taking 3 months to lose 6-7 lbs is reasonable.

As for not being able to lift much--that's completely normal for an untrained person. Remember that strength training is training done in order to get stronger. Think of it like piano lessons. When you first start piano lessons you're not expected to already know how to play the instrument. You learn and improve along the way. When you first start lifting, you're a beginner and the learn and improve along the way.

If you want to get stronger, start with a basic beginner's program. Strong Curves may be a good book (get the book, not just the free template online and not the ebook.) That book has 3 full body programs. One is bodyweight only (pushups, bodyweight squats, etc.) It's 12 weeks long but the program changes slightly every 4 weeks. If you started with it in the next week or two, you would be finished by the end of your goal period. Then you could either move onto the beginner's lifting program that's in the book or find another program.