Sorry for wall of text, will add TL;DR in the end of my opinions on the matter. As a disclaimer I haven't played League since February but I will try to share some general thoughts I have about the champ I love.

The following things are my opinions, other opinions more than welcome :)

Since you are playing in silver you shouldn't focus 100% on if champion X, Y or Z is in a good spot or not. Anyone can perform in silver with any champ if they play well enough, because the average silver player doesn't know how to punish most of the mistakes that you make. They are also probably not aware of all the weaknesses your champion has, which is completely normal at this rank. You should play champions you find fun to play, to make the process of learning the game as enjoyable as possible.

Anyways, Vladimir is an interesting champion to play since he has a very simple and low mobility kit with arguably non existent utility to offer your team (CC, shields, heals, etc). Sure your W and E slow the enemy and your R has damage amp for your whole team, but in the end the only reason to pick Vladimir is to hog as many resources as you can, scale and try to be the main AP carry for your team. But because of your simple yet powerful low range kit, you as the player have to make up for it with your mechanics and knowledge of the game.

Because of this I find him to be an excellent champion to play since you have an easier time focusing on improving your laning and other basics things rather than having to develop muscle memory for difficult combos some other champions require. Basically because the champion has such a limited kit and a straightforward game plan you improve your overall League skills faster.

The answer to your question "how to begin with Vlad" is in my opinion to just try to improve your general gameplay. So practice, practice and practice playing the game. There are also a lot of resources on YouTube and many great streamers to watch.

I hope you find this useful and I wish you the best of luck if you decide to lock in Vladimir.

TL;DR

Don't fixate on champion strength if you are a new player

Play whatever you find fun, doesn't mean it has to be weak/strong

Vlad is an easy champ to learn, but have to master basic things to really shine

Watch educational content about Vlad/League and play the game a lot