What rating and how much practice would someone do before playing in a tournament if they don't want to lose badly?

I'm 700 and already playing well on chess.com live tournaments, they try to match you up with people of equal strength

Live tournaments are harder, but once you achieve 1000, you should play the ones that are 1200 and lower

I would say you can do tournaments with almost any rating but you really want a number prehaps 700 and over.

im 1500 and play in a lot of

tournaments.but a good rating to play in

tournaments is 1000+

On live chess I am good at time management and defense but terrible at attacking and checkmate. How is tournament play style usually, is it attack with every famous gambit or is it analytical and defensive?

play what you are good in

In a tournament I think I would be really good at longer times with increments.

It's the same as something you'd usually play just over the board.

a good tournament rating is 1000+

If you both play defensively, the game will go nowhere. There isn't really a "style" for how to play in tournaments. Play according to how the game goes, sometimes defensive, sometimes offensive.

Is there a 60 minute format with elimination rounds in this club

Is there a famous gambit that is frequently played

I come from the era where this seems an odd question, since going to tournaments is how we got rated, and until you went you had no rating. Also, would depend completely on what you hope to gain from it - you can go to an over-the-board tournament and have fun gaining the experience of doing so, as well as managing clock and notating the move, at any rating.

there's a bunch of gambits that are frequently played, but it's not any different from something you'd face in an online game.

at least 1000

Depends on your age. Lots of scholastic tournaments are flooded with players under 1000. Take your chess.com rapid rating and subtract about 200 points to get a since of where your strength is... look at the sections (e.g., U1200, U1400, U1800 etc.). I'd recommend playing one section up. So if you are like 1100, play U1400

this is true only for tournaments with rounds, if a tournament is based on points, (where there is a time limit, and you can play as many games as you want) people will always play attacking gambits, because the faster you get a game done even if you lose some of them, you can play more getting more points.

Does anybody know about the tournament in Texas which is nationals

If we're talking about chess.com arena tournaments then I say just play. You're matched with players with similar ratings so the games should be competitive, when you discount the cheaters. The ten minute limit is kind of tough, but as long as you have fun and review your games the experience is worth it. My two cents.